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<IMG border="0" height="14" hspace="0" src="resources/close.gif" vspace="0" width="120"><BR></TD><TD align="left" valign="top" width="*"><TABLE border="0" cellpadding="3" cellspacing="0"><TR><TD><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Introduction</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
<I>XSP</I>
(<A href="http://xml.apache.org/cocoon/xsp.html">eXtensible Server Pages</A>)
is Cocoon's technology for building web applications based on dynamic
XML content.
</P>
<P align="justify">
Beyond static content (i. e., hand-written documents produced
by web authors), web applications demand <I>dynamic content
generation</I> capabilities, where XML documents or fragments
are programmatically produced at request time.
</P>
<P align="justify">
In this context, content is the result of computations based on request
parameters and, often, on access to external data sources such as
databases or remote server processes.
</P>
<P align="justify">
This distinction in content origin extends the "traditional"
regions of web publishing (<I>content</I> and <I>presentation</I>)
to also encompass that of <I>logic</I>.
</P>
<P align="justify">
Dynamic web content generation has traditionally been addressed by
embedding procedural code into otherwise static markup.
</P>
<P align="justify">
This approach is fully supported by XSP. Consider the following example:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>. . .
<p>
Good
<xsp:logic>
String timeOfDay = (
new SimpleDateFormat("aa")
).format(new Date());
if (timeOfDay.equals("AM")) {
<xsp:content>Morning</xsp:content>
} else {
<xsp:content>Afternoon</xsp:content>
}
</xsp:logic>!
</p>
. . .</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Upon XSP processing, this XML fragment will yield:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><p>Good Morning!</p></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
before noon and:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><p>Good Afternoon!</p></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
afterwards.
</P>
<P align="justify">
While the above may appear simple (to a Java developer,
that is!), XSP has been conceived to allow web authors
to generate dynamic content without forcing them to learn
a programming language.
</P>
<P align="justify">
Thus, XSP allows us to rephrase our example as:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>...
<p>Good <util:time-of-day/>!</p>
...</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
where <CODE><FONT face="courier, monospaced"><util:time-of-day/></FONT></CODE> is a
<I>library tag</I> encapsulating dynamic content
in a simple, transparent way.
</P>
<P align="justify">
This feature promotes an ideal division of labor
where:
</P>
<BLOCKQUOTE><UL>
<LI>
<I>Application Developers</I> encapsulate application
logic in a consistent, intuitive dynamic tagset
</LI>
<LI>
<I>Content authors</I> use an application-oriented
markup vocabulary (augmented with dynamic tags) to
produce XML documents
</LI>
<LI>
<I>Presentation designers</I> write XSLT stylesheets
to render the resulting content as visually appealing web
pages
</LI>
</UL></BLOCKQUOTE>
<P align="justify">
Of course, for those of us subject to "real world" constraints,
XSP also supports the time-honored approach of first using
embedded logic and then incrementally evolving the resulting
pages into a well-structured web application.
</P>
<P align="justify">
These concepts are illustrated in the XSP Samples included in the
distribution. David Parry has also written a nice
<A href="http://www.suranyami.com/XSPtutorial/">
tutorial</A> to supplement this documentation.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>What is an XSP Page?</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
An XSP page is a Cocoon XML document containing tag-based
directives that specify how to generate dynamic content
at request time.
</P>
<P align="justify">
Upon Cocoon processing, these directives are replaced by
generated content so that the resulting, augmented XML
document can be subject to further processing (typically
an XSLT transformation)
</P>
<P align="justify">
XSP pages are transformed into Cocoon <I>producers</I>,
typically as Java classes, though any scripting language
for which a Java-based processor exists could also be used.
</P>
<P align="justify">
Directives can be either XSP built-in processing tags or
user-defined library tags.
XSP built-in tags are used to embed procedural logic,
substitute expressions and dynamically build XML nodes.
User-defined library tags act as templates that dictate
how program code is generated from information encoded in
each dynamic tag.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>A Simple Example: Embedded Logic</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
In the following XSP page, the Java language is used to
generate some dynamic content:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><?xml version="1.0"?>
<?cocoon-process type="xsp"?>
<?cocoon-process type="xslt"?>
<?xml-stylesheet href="sample.xsl" type="text/xsl"?>
<xsp:page language="java" xmlns:xsp="http://www.apache.org/1999/XSP/Core">
<page title="Time of Day">
<xsp:logic>
// Define a variable to hold the time of day
Date now = new Date();
</xsp:logic>
<p>
To the best of my knowledge, it's now
<!-- Substitute time of day here -->
<xsp:expr>now</xsp:expr>
</p>
</page>
</xsp:page></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Upon Cocoon processing, this page should yield something
like:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><html>
<head><title>Time of Day</title></head>
<body>
<h3 style="color: navy; text-align: center">Time of Day</h3>
<p>It's now Thu Dec 23 20:11:18 PST 1999</p>
</body>
</html></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Let's dissect this example:
</P>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>The XSP Processing Instruction</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
Two processing instructions are used in our example
to control how Cocoon processes its XML content:
</P>
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced"><?cocoon-process type="xsp"?></FONT></CODE><BR>
instructs Cocoon to generate a program (a
<I>producer</I>) that rebuilds the static portions
of the document as augmented by the embedded logic
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><?cocoon-process type="xslt"?></FONT></CODE><BR>
<CODE><FONT face="courier, monospaced"><?xml-stylesheet href="sample.xsl" type="text/xsl"?></FONT></CODE><BR>
instructs Cocoon to apply the sample.xsl XSLT stylesheet to
the XML tree resulting from executing the generated
XSP producer program
</LI>
</UL></BLOCKQUOTE>
<P align="justify">
Note that it is <I>not</I> mandatory for an XSP page to
be further processed by XSLT. Any (or none) other Cocoon XML
processing step(s) may be subsequently applied depending on
application requeriments.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>The XSP Namespace</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
All XSP directives belong to the <CODE><FONT face="courier, monospaced"><xsp:></FONT></CODE>
namespace.
</P>
<P align="justify">
Also, XSP pages are <I>required</I> to have an
<CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE> root element:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:page language="java" xmlns:xsp="http://www.apache.org/1999/XSP/Core"></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE> root element can specify
the programming language used in the XSP page by means of
the <CODE><FONT face="courier, monospaced">language</FONT></CODE> attribute. If this attribute is
omitted, <I>java</I> will be used.
</P>
<P align="justify">
The root element must also specify the XSP namespace URL
by means of the <CODE><FONT face="courier, monospaced">xmlns:</FONT></CODE> attribute. As will be
explained later, this attribute is also used to introduce
user-supplied tag libraries.
</P>
<P align="justify">
Finaly, the XSP root element must contain <I>only one</I>
non-XSP nested element. Such element (<CODE><FONT face="courier, monospaced"><page></FONT></CODE>
in the above example) will become the root element of the
generated document.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>The Logic Tags</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
In our example, the "user" root element contains:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><page title="Time of Day">
<xsp:logic>
// Define a variable to hold the time of day
Date now = new Date();
</xsp:logic>
<p>
To the best of my knowledge, it's now
<!-- Substitute time of day here -->
<xsp:expr>now</xsp:expr>
</p>
</page></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Here, we use the two essential XSP logic tags:
</P>
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>. This tag encloses
developer-supplied program logic. Such logic will be
transcribed verbatim into the generated Cocoon
producer.
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE>. This tag evaluates
a program expression and substitutes its value as
a <CODE><FONT face="courier, monospaced">Text</FONT></CODE> DOM node in the resulting
document.
</LI>
</UL></BLOCKQUOTE>
<P align="justify">
In the fragment:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:logic>
// Define a variable to hold the time of day
Date now = new Date();
</xsp:logic></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
a new variable (<CODE><FONT face="courier, monospaced">now</FONT></CODE>) is declared that can
be subsequently referenced anywhere in the remaining
page content.
</P>
<P align="justify">
Note that, in this particular example, it's not necessary
to fully specify the Java type (<CODE><FONT face="courier, monospaced">java.util.Date</FONT></CODE>)
because XSP automatically generates <CODE><FONT face="courier, monospaced">import</FONT></CODE>
statements for the most commonly used Java libraries.
</P>
<P align="justify">
In the fragment:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><!-- Substitute time of day here -->
<xsp:expr>now</xsp:expr></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
the variable <CODE><FONT face="courier, monospaced">now</FONT></CODE> is referenced so that its
value is inlined in the resulting XML document as a
<CODE><FONT face="courier, monospaced">Text</FONT></CODE> node.
</P>
<P align="justify">
Note also that it's not necessary to explicitly cast
<CODE><FONT face="courier, monospaced">now</FONT></CODE> to <CODE><FONT face="courier, monospaced">String</FONT></CODE>.
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> takes care
of converting all Java types so that values are properly
converted depending on context.
</P>
<P align="justify">
In general, <CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> values are inlined
according to the following rules:
</P>
<BLOCKQUOTE><UL>
<LI>
Primitive Java types (<CODE><FONT face="courier, monospaced">int</FONT></CODE>, <CODE><FONT face="courier, monospaced">long</FONT></CODE>,
etc) are converted to their <CODE><FONT face="courier, monospaced">String</FONT></CODE> representation
and wrapped as <CODE><FONT face="courier, monospaced">Text</FONT></CODE>
</LI>
<LI>
Java objects are wrapped as follows:
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced">String</FONT></CODE>s are directly wrapped as
<CODE><FONT face="courier, monospaced">Text</FONT></CODE>
</LI>
<LI>
Arrays are wrapped as <CODE><FONT face="courier, monospaced">DocumentFragments</FONT></CODE>
and each element is recursively applied these same
transformation rules.
</LI>
<LI>
Non-string objects are converted to <CODE><FONT face="courier, monospaced">String</FONT></CODE>
(by means of their <CODE><FONT face="courier, monospaced">toString</FONT></CODE> method)
and subsquently wrapped as <CODE><FONT face="courier, monospaced">Text</FONT></CODE>.
Note that some types may not provide a suitable
string representation, so they may require a
more elaborate expression
</LI>
</UL></BLOCKQUOTE>
</LI>
</UL></BLOCKQUOTE>
<P align="justify">
A nice XSP feature (not present in other server pages
technologies) is that the <CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
element allows for the arbitrary nesting of other markup
without the need to "prematurely" close it. For example:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><table>
<xsp:logic>
for (int i = 0; i &lt; countries.length; i++) {
<tr>
<td>
<xsp:expr>countries[i].getName()</xsp:expr>
</td>
<td>
<xsp:expr>countries[i].getCurrency()</xsp:expr>
</td>
</tr>
}
</xsp:logic>
</table></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
If such nesting was not allowed, the purely programmatic
alternative would be considerably more complex:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>
<table>
<xsp:logic>
for (int i = 0; i &lt; countries.length; i++) {
// <tr>
xspParentNode = xspCurrentNode;
xspNodeStack.push(xspParentNode);
xspCurrentNode = document.createElement("tr");
xspParentNode.appendChild(xspCurrentNode);
// <td>name</td>
xspParentNode = xspCurrentNode;
xspNodeStack.push(xspParentNode);
xspCurrentNode = document.createElement("td");
xspParentNode.appendChild(xspCurrentNode);
xspCurrentNode.appendChild(
document.createTextNode(countries[i].getName())
);
xspCurrentNode = (Node) xspNodeStack.pop();
// <td>currency</td>
xspParentNode = xspCurrentNode;
xspNodeStack.push(xspParentNode);
xspCurrentNode = document.createElement("td");
xspParentNode.appendChild(xspCurrentNode);
xspCurrentNode.appendChild(
document.createTextNode(countries[i].getCurrency())
);
xspCurrentNode = (Node) xspNodeStack.pop();
// </tr>
xspCurrentNode = (Node) xspNodeStack.pop();
}
</xsp:logic>
</table>
</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Note, however, that it is <I>not</I> allowed to nest
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> tags directly inside
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>. For an expression
to be inlined inside an <CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
element, it must be escaped by surrounding it with an
<CODE><FONT face="courier, monospaced"><xsp:content></FONT></CODE> tag. Example:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>
<xsp:logic>
for (int i = 0; i &lt; parameterValues.length; i++) {
<xsp:content>
<xsp:expr>parameterValues[i]</xsp:expr>
</xsp:content>
<br/>
}
</xsp:logic>
</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
The observant reader may have noticed a rather
unpleasant feature in the above code: the
<I>less-than</I> sign (<CODE><FONT face="courier, monospaced"><</FONT></CODE>)
must be represented as <CODE><FONT face="courier, monospaced">&lt;</FONT></CODE>!
</P>
<P align="justify">
This is an undesirable (but unavoidable) consequence
of the <CODE><FONT face="courier, monospaced"><</FONT></CODE> and <CODE><FONT face="courier, monospaced">&</FONT></CODE>
characters being special to XML parsers.
</P>
<P align="justify">
A workaround is to escape code chunks contaning the
<I>less-than</I> (<CODE><FONT face="courier, monospaced"><</FONT></CODE>) and
<I>ampersand</I> (<CODE><FONT face="courier, monospaced">&</FONT></CODE>) characters as
<I>CDATA</I> sections:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><table>
<xsp:logic><![CDATA[
for (int i = 0; i < countries.length; i++)]]>
<tr>
. . .
</tr>
}
</table>
</xsp:logic></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Caution must be exercised, though, to avoid enclosing
static markup inside the <CODE><FONT face="courier, monospaced"><![CDATA]]></FONT></CODE>
section, as this will result in syntax errors upon
compiling the generated Cocoon producer!
</P>
</FONT></TD></TR></TABLE></DIV><BR>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Another Example: Tag Libraries</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
In the following example, a developer-supplied <I>tag
library</I> is used instead of embedding procedural code:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><?xml version="1.0"?>
<?cocoon-process type="xsp"?>
<?cocoon-process type="xslt"?>
<?xml-stylesheet href="sample.xsl" type="text/xsl"?>
<xsp:page
language="java"
xmlns:xsp="http://www.apache.org/1999/XSP/Core"
xmlns:example="http://www.plenix.com/DTD/XSP/Example"
>
<page title="Time of Day">
<p>
To the best of my knowledge, it's now
<!-- Substitute time of day here -->
<example:time-of-day format="yy/MM/dd hh:mm:ss aa"/>
</p>
</page>
</xsp:page></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Here, the web author is shielded from programming
complexities at the expense of additional developer
effort in devising and implementing a proper dynamic
tagset.
</P>
<P align="justify">
As mentioned early, this is the "ideal" XSP scenario:
dynamic content generation requirements are identified
before hand and represented in reusable tag libraries.
Web authors can then focus on their their "true"
purpose in life: producing content.
</P>
<P align="justify">
XSP uses XSLT stylesheets for source code generation.
Thus, each dynamic tag in a library is supported by an
XSLT template containing the program logic to be
generated. Upon execution, generated logic will yield
the dynamic content encoded by its underlying dynamic
tag.
</P>
<P align="justify">
Without yet delving into the finer details of the XSP
object model, let's see how the <I>example</I> tag
library stylesheet looks like:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><?xml version="1.0"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/XSL/Transform/1.0"
xmlns:xsp="http://www.apache.org/1999/XSP/Core"
xmlns:example="http://www.plenix.com/DTD/XSP/Example"
>
<xsl:template match="xsp:page">
<xsp:page>
<xsl:copy>
<xsl:apply-templates select="@*"/>
</xsl:copy>
<xsp:structure>
<xsp:include>java.util.Date</xsp:include>
<xsp:include>java.text.SimpleDateFormat</xsp:include>
</xsp:structure>
<xsp:logic>
/* "Example" Class Level Logic */
private static String formatDate(Date date, String pattern) {
if (pattern == null || pattern.length() == 0) {
pattern = "yyyy/MM/dd hh:mm:ss aa";
}
return (new SimpleDateFormat(pattern)).format(date);
}
</xsp:logic>
<xsl:apply-templates/>
</xsp:page>
</xsl:template>
<xsl:template match="example:time-of-day">
<xsp:expr>
formatDate(new Date(), "<xsl:value-of select="@format"/>")
</xsp:expr>
</xsl:template>
<xsl:template match="@*|node()" priority="-1">
<xsl:copy><xsl:apply-templates select="@*|node()"/></xsl:copy>
</xsl:template>
</xsl:stylesheet></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Let's focus our attention on 4 key features of
this library:
</P>
<BLOCKQUOTE><UL>
<LI>Namespace</LI>
<LI>Structure</LI>
<LI>Class-level logic</LI>
<LI>Tag code templates</LI>
</UL></BLOCKQUOTE>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Library Namespace</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
Each XSP library defines a <I>separate</I> XML
namespace:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>xmlns:example="http://www.plenix.com/DTD/XSP/Example"</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Thus, all dynamic tags should belong to the same namespace
associated with their defining library
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><example:time-of-day format="hh:mm:ss"/></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
While this discipline is not enforced by XSP, developers
are strongly encouraged to follow this pattern because it
prevents ambiguities and promotes document readability.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Program Structure</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:structure></FONT></CODE> section provides
the context for program-level declarations such
as the Java <CODE><FONT face="courier, monospaced">import</FONT></CODE> directive.
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:structure>
<xsp:include>java.util.Date</xsp:include>
<xsp:include>java.text.SimpleDateFormat</xsp:include>
</xsp:structure></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:structure></FONT></CODE> tag may contain
zero or more <CODE><FONT face="courier, monospaced"><xsp:include></FONT></CODE> directives,
each specifying an external program module to be made
available to the generated XSP program.
</P>
<P align="justify">
Note that the exact semantics of this elments is
language-dependent. For Java, it corresponds to
an <CODE><FONT face="courier, monospaced">import</FONT></CODE> statement. For Fesi
Javascript, for example, it may be interpreted as
a <CODE><FONT face="courier, monospaced">load()</FONT></CODE> function call.
</P>
<P align="justify">
In our example, we're importing the
<CODE><FONT face="courier, monospaced">java.util.Date</FONT></CODE> and
<CODE><FONT face="courier, monospaced">java.text.SimpleDateFormat</FONT></CODE>
class definitions.
</P>
<P align="justify">
In all honesty, though, including
<CODE><FONT face="courier, monospaced">java.util.Date</FONT></CODE> is redundant because
XSP always imports <CODE><FONT face="courier, monospaced">java.util.*</FONT></CODE>. It's
included here only to emphasize that the
<I>example</I> library depends on it.
</P>
<P align="justify">
<CODE><FONT face="courier, monospaced">java.text.SimpleDateFormat</FONT></CODE>, on the other
hand, <I>must</I> be included, because it's not among
XSP's "preferred" Java packages.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Class-level logic</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
In general, XSP class-level declarations (such as instance
variables or methods) are defined by means of
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE> blocks
<I>placed outside the user root element</I>.
</P>
<P align="justify">
XSP libraries exploit this feature to declare class-level
variables and methods used by code generated in reponse to
the use of dynamic tags in XSP pages.
</P>
<P align="justify">
In our example, the following method is used to generate
a <CODE><FONT face="courier, monospaced">String</FONT></CODE> representation of the current system
time:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:logic>
/* "Example" Class Level Logic */
private static String formatDate(Date date, String pattern) {
if (pattern == null || pattern.length() == 0) {
pattern = "yyyy/MM/dd hh:mm:ss aa";
}
return (new SimpleDateFormat(pattern)).format(date);
}
</xsp:logic></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Dynamic tag templates may then refer to this method.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Tag Code template</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
Finally, each dynamic tag must provide an associated
XSLT template that dictates what source code must be
generated whenever the tag is encountered in an XSP
page.
</P>
<P align="justify">
Note that the source code to be generated must be
enclosed in either an <CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE>
or an <CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE> element. This
is so because these XSP tags will be later evaluated
by the XSP built-in library (itself an XSLT stylesheet!)
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsl:template match="example:time-of-day">
<xsp:expr>
formatDate(new Date(), "<xsl:value-of select="@format"/>")
</xsp:expr>
</xsl:template></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
In this example, each reference to a
<CODE><FONT face="courier, monospaced"><example:time-of-day></FONT></CODE> tag
will be replaced by a corresponding
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> "call". Thus,
if an XSP page using the <I>example</I>
library contains:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><example:time-of-day format="hh:mm:ss"/></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
XSP will expand this reference to:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:expr>formatDate(new Date(), "hh:mm:ss")</xsp:expr></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
during library processing. Upon source program
generation this directive will be finally
expanded
to:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>
xspCurrentNode.appendChild(
xspExpr(
formatDate(new Date(), "hh:mm:ss"),
document
)
);
</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
where the <CODE><FONT face="courier, monospaced">xspExpr()</FONT></CODE> built-in method is
overloaded to wrap all possible Java types as a
<CODE><FONT face="courier, monospaced">Text</FONT></CODE> Node.
</P>
<P align="justify">
Finicky developers may prefer to map dynamic tags to
<I>bean</I> method calls, as opposed to inlining
"raw" Java code.
</P>
<P align="justify">
While some may consider this a matter of taste, using
bean properties and methods <I>is</I> certainly
advisable because it isolates library code from
implementation details. This would allow, for instance,
for a complex Enterprise Java Bean to be modified
without impacting existing XSP pages.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>The XSP Tagset</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Tag List</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE><BR>
This element is the root of all XSP pages and
specifies the scripting language and the tag
libraries used by a particular XSP page
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:structure></FONT></CODE><BR>
This top-level element encloses source
program-level declarations such as
<CODE><FONT face="courier, monospaced"><xsp:include></FONT></CODE>
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:include></FONT></CODE><BR>
This element is used to import external
module definitions in a language-dependent
way
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE><BR>
This element is used to embed procedural
logic in an XSP page. Enclosed code is
transcribed verbatim into the generated
<CODE><FONT face="courier, monospaced">XSPPage</FONT></CODE> producer. Other
XSP or user markup may be nested inside
this tag
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:content></FONT></CODE><BR>
This element is used to embed "regular"
XML content inside an
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE> block
so that no nested additional
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
sections are required
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE><BR>
This element inlines a program
expression as a <CODE><FONT face="courier, monospaced">Text</FONT></CODE> node,
except when used directly inside another
<CODE><FONT face="courier, monospaced"><xsp:></FONT></CODE> element,
where it is substituted as an
expression, not a node. If you
want to substitute an
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> tag
as a node inside another XSP
tag, you must enclose it in an
<CODE><FONT face="courier, monospaced"><xsp:content></FONT></CODE> element.
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:element></FONT></CODE><BR>
This tag is used to dynamically build
an element when its attribute values
are not known at compile time
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:attribute></FONT></CODE><BR>
This element is used to dynamically provide
attribute values for a given element (which
can be specified statically as markup or
dynamically by means of
<CODE><FONT face="courier, monospaced"><xsp:element></FONT></CODE>).
This tag is typically used in conjunction
with <CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE>,
where the substituted expression is
always cast to <CODE><FONT face="courier, monospaced">String</FONT></CODE>
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:pi></FONT></CODE><BR>
This element is used to dynamically create
a processing instruction.
</LI>
<LI>
<CODE><FONT face="courier, monospaced"><xsp:comment></FONT></CODE><BR>
This element is used to dynamically create
an XML comment.
</LI>
</UL></BLOCKQUOTE>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Notes on Tag Usage</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B><xsp:page></B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE> root element
has an optional <CODE><FONT face="courier, monospaced">language</FONT></CODE> attribute
that defaults to <I>java</I>. Other scripting
languages (both interpreted and compiled) will
be supported in the near future.
</P>
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE> root element
requires one or more <CODE><FONT face="courier, monospaced">xmlns:</FONT></CODE> attributes
specifying tag libraries. These attributes specify
each tag library's DTD location as a URL.
</P>
<P align="justify">
At least the built-in XSP (currently,
<CODE><FONT face="courier, monospaced">xmlns:xsp="http://www.apache.org/1999/XSP/Core"</FONT></CODE>)
library must be specified.
</P>
<P align="justify">
The order in which <CODE><FONT face="courier, monospaced">xmlns:</FONT></CODE> attributes appear
dictates library processing order. The XSP built-in
library, though, is always applied last, regardless of its
position in the <CODE><FONT face="courier, monospaced">xmlns:</FONT></CODE> attribute list.
</P>
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE> element can only
have <I>one</I> user element. This element
becomes the root of the generated XML document.
</P>
<P align="justify">
Only the following node types are valid as direct
descendants of the <CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE>
root element:
</P>
<BLOCKQUOTE><UL>
<LI>
Zero or more <CODE><FONT face="courier, monospaced"><xsp:structure></FONT></CODE>
elements.
</LI>
<LI>
Zero or more <CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
elements.
</LI>
<LI>
The user root element: as in <I>Highlander</I>,
there can be only one.
</LI>
</UL></BLOCKQUOTE>
<P align="justify">
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
blocks that are direct descendants of the
<CODE><FONT face="courier, monospaced"><xsp:page></FONT></CODE> root element
(i. e., placed <I>outside</I> the
user root element) are generated as
class-level logic. This is used for declaring
class fields and methods.
</P>
<P align="justify">
Top-level processing instructions (other than
<CODE><FONT face="courier, monospaced"><?cocoon-process type="xsp"?></FONT></CODE>)
are preserved in the generated XML document.
This is convenient, for example, for subsequent
XSLT processing.
</P>
<P align="justify">
Some Java packages are always imported by
default. As such, they do not require
explicit <CODE><FONT face="courier, monospaced"><xsp:include></FONT></CODE>
directives. These packages are:
</P>
<BLOCKQUOTE><UL>
<LI><CODE><FONT face="courier, monospaced">java.io.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">java.util.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">org.w3c.dom.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">org.xml.sax.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">javax.servlet.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">javax.servlet.http.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">org.apache.cocoon.parser.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">org.apache.cocoon.producer.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">org.apache.cocoon.framework.*;</FONT></CODE></LI>
<LI><CODE><FONT face="courier, monospaced">org.apache.cocoon.processor.xsp.*;</FONT></CODE></LI>
</UL></BLOCKQUOTE>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B><xsp:logic> and <xsp:content></B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
<CODE><FONT face="courier, monospaced"><xsp:content></FONT></CODE>
can be used inside
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
blocks to avoid the recursive nesting of
additional <CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
elements. Thus, the following XSP fragment
(which contains nested
<CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE> blocks):
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>. . .
<p>
Good
<xsp:logic>
String timeOfDay = (new SimpleDateFormat("aa")).format(new Date());
if (timeOfDay.equals("AM")) {
</xsp:logic>
Morning
<xsp:logic>
} else {
</xsp:logic>
Afternoon
<xsp:logic>
}
</xsp:logic>!
</p>
. . .</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
can be rewritten as:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>. . .
<p>
Good
<xsp:logic>
String timeOfDay = (new SimpleDateFormat("aa")).format(new Date());
if (timeOfDay.equals("AM")) {
<xsp:content>Morning</xsp:content>
} else {
<xsp:content>Afternoon</xsp:content>
}
</xsp:logic>!
</p>
. . .</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Note that this does not work in cases where a
non-empty element would be "truncated" by an
interspersed <CODE><FONT face="courier, monospaced"><xsp:logic></FONT></CODE>
block. Thus, the following example cannot be
reduced by means of <CODE><FONT face="courier, monospaced"><xsp:content></FONT></CODE>
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:logic>
Enumeration enum = request.getParameterNames();
while (enum.hasMoreElements()) {
String parameterName = (String) enum.nextElement();
String[] parameterValues =
request.getParameterValues(parameterName);
<tr>
<td valign="top">
<xsp:expr>parameterName</xsp:expr>
</td>
<!-- Trouble here -->
<td>
<xsp:logic>
for (int i = 0; i &lt; parameterValues.length; i++) {
<xsp:content>
<xsp:expr>parameterValues[i]</xsp:expr>
</xsp:content>
<br/>
}
</xsp:logic>
</td>
<!-- End trouble -->
</tr>
}
</xsp:logic></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
because the second <CODE><FONT face="courier, monospaced"><td></FONT></CODE> would be
"cut short" by any intervening
<CODE><FONT face="courier, monospaced"><xsp:content></FONT></CODE>.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B><xsp:element> and <xsp:attribute></B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:element></FONT></CODE> tag
(which requires a <CODE><FONT face="courier, monospaced">name</FONT></CODE> attribute)
is used in those cases where the element
name is known at compile time, but its
attribute values are not. For example:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:logic>
for (int i = 0; i &lt; languages.length; i++) {
<tr>
<td>
<img>
<xsp:attribute name="src">img/
<xsp:expr>languages[i].getCode()</xsp:expr>
.gif</xsp:attribute>
</img>
</td>
<td>
<xsp:expr>languages[i].getName()</xsp:expr>
</td>
</tr>
}
</xsp:logic></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Only XML text and <CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> are
valid inside an <CODE><FONT face="courier, monospaced"><xsp:attribute></FONT></CODE>
element.
</P>
<P align="justify">
Note that whitespace is significant inside
<CODE><FONT face="courier, monospaced"><xsp:attribute></FONT></CODE>
so indenting <CODE><FONT face="courier, monospaced"><xsp:attribute></FONT></CODE>
content may result in spurious space being
generated. Unless you <I>really</I> need
to generate spaces as part of the attribute
value, resist the temptation to write something
like:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><img>
<xsp:attribute name="src">
img/
<xsp:expr>
languages[i].getCode()
</xsp:expr>
.gif
</xsp:attribute>
</img></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
Finally, if an element name is <I>not</I>
known at compile time, you must programatically
create it:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:logic>
String tagName = null;
if (ordered) {
tagName = "ol";
} else {
tagName = "ul";
}
xspParentElement = xspCurrentElement;
xspNodeStack.push(xspParentElement);
xspCurrentElement = document.createElement(tagName);
</xsp:logic>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
<xsp:logic>
xspCurrentElement = (Node) xspNodeStack.pop();
</xsp:logic></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
This may be alleviated in future XSP versions
by introducing an idiom similar to the XSLT way
of substituting dynamic expressions inside
attributes values:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:element name='{ordered ? "ol" : "ul"}'>
<li>Item 1</li>
<li>Item 2</li>
<li>Item 3</li>
</xsp:element></PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B><xsp:pi></B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
The <CODE><FONT face="courier, monospaced"><xsp:pi></FONT></CODE> element
requires a <CODE><FONT face="courier, monospaced">target</FONT></CODE> attribute
specifying the processing instruction name.
</P>
<P align="justify">
<CODE><FONT face="courier, monospaced"><xsp:expr></FONT></CODE> is supported within xsp:pi -
for example:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE><xsp:pi target="xml-stylesheet">
href="<xsp:expr>request.getQueryString()</xsp:expr>"
type="text/xsl"
</xsp:pi>
</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
<P align="justify">
In the future, <CODE><FONT face="courier, monospaced"><xsp:pi></FONT></CODE> may be
renamed to <CODE><FONT face="courier, monospaced"><xsp:processing-instruction></FONT></CODE>
to achieve compatibility with XSLT.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B><xsp:comment></B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
Note that dynamically created comments
(<CODE><FONT face="courier, monospaced"><xsp:comment></FONT></CODE>)
may be removed by subsequent XSLT processing.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
</FONT></TD></TR></TABLE></DIV><BR>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>The XSP Object Model</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Processors and Producers</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
A <I>processor</I> is a Cocoon Java type that
takes a DOM tree as input and produces another
(possibly modified) DOM tree as output. This
concept is similar to that of a Unix "filter"
in a command pipeline.
</P>
<P align="justify">
The XSP engine is implemented as a Cocooon processor
that accepts an XSP page as input. The first time a
given XSP page is processed, it is translated into an
equivalent source program which is then compiled, loaded
and executed. Subsequent requests for the same XSP page
result in the execution of the generated program.
As you may expect, the output DOM tree returned by the
XSP engine processor is actually built by the generated
program.
</P>
<P align="justify">
XSP pages are compiled into Cocoon producers.
A <I>producer</I> is a Cocoon Java type normally used to
"feed" the initial XML content to the Cocoon processing
pipeline.
</P>
<P align="justify">
Thus, for example, when Cocoon serves a static, "regular"
XML document, file contents are actually delivered by
Cocoon's built-in <CODE><FONT face="courier, monospaced">FileProducer</FONT></CODE>.
</P>
<P align="justify">
Whereas other related server pages technologies (such as
JSP) generate <I>servlets</I>, XSP generates producers
instead. This is so because, among other reasons,
the servlet model does not yet provide a mechanism for
portably and efficiently post-processing XML content.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>XSP Built-in Objects</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
XSP defines an abstract producer (<CODE><FONT face="courier, monospaced">XSPPage</FONT></CODE>)
as the base class for generated programs.
</P>
<P align="justify">
This class exposes a simple object model that can
be easily used by XSP developers to programmatically
control how XML content is generated.
</P>
<P align="justify">
The following objects are accesible inside an XSP
page:
</P>
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced">request</FONT></CODE>.
A Cocoon-supplied wrapper to the standard
<CODE><FONT face="courier, monospaced">HttpServletRequest</FONT></CODE> object.
This wrapper provides all the functionality
defined for its JSDK interface counterpart.
This object is typically used to retrieve
Http form parameters as well as to get
header and cookie information.
</LI>
<LI>
<CODE><FONT face="courier, monospaced">response</FONT></CODE>.
A Cocoon-supplied wrapper to the standard
<CODE><FONT face="courier, monospaced">HttpServletResponse</FONT></CODE> object.
This wrapper provides most of the
functionality defined for its JSDK
interface counterpart,
<I>except for access to the</I>
<CODE><FONT face="courier, monospaced">ServletOutputStream</FONT></CODE><I>object
and its associated writer</I>.
This restriction
is necessary to ensure consistent Cocoon
servlet output and does not impose any
limitation to XML processing. Other suitable,
non-output operations (such as setting headers,
cookies or content types) are allowed
</LI>
<LI>
<CODE><FONT face="courier, monospaced">session</FONT></CODE>.
The standard <CODE><FONT face="courier, monospaced">HttpSession</FONT></CODE> servlet
object. This object is typically used to
store data associated with a user HTTP session
</LI>
<LI>
<CODE><FONT face="courier, monospaced">servletContext</FONT></CODE>.
The standard <CODE><FONT face="courier, monospaced">ServletContext</FONT></CODE>
object. This object is typically used to
store application-level data by means
of its <CODE><FONT face="courier, monospaced">setAttribute</FONT></CODE> and
<CODE><FONT face="courier, monospaced">getAttribute</FONT></CODE> methods. Other
uses include determining the real path
of a URL as dictated by the underlying web
server virtual directory structure. Note
that the application-level data sharing
capabilities offered by this object are
available only for JSDK version 2.2 and
higher. To circumvent this for JSDK prior
to 2.2, use the <CODE><FONT face="courier, monospaced">xspGlobal</FONT></CODE>
object (explained below)
</LI>
<LI>
<CODE><FONT face="courier, monospaced">document</FONT></CODE>.
An XSP-supplied <CODE><FONT face="courier, monospaced">org.w3c.Document</FONT></CODE>
object. Initially empty, this object is populated
by the generated <CODE><FONT face="courier, monospaced">XSPPage</FONT></CODE> producer
and is typically used as a node factory
(<CODE><FONT face="courier, monospaced">document.createElement()</FONT></CODE>,
<CODE><FONT face="courier, monospaced">document.createProcessingInstruction()</FONT></CODE>,
etc)
</LI>
<LI>
<CODE><FONT face="courier, monospaced">xspGlobal</FONT></CODE>.
An XSP-supplied global dictionary offering
the same <CODE><FONT face="courier, monospaced">setAttribute</FONT></CODE> and
<CODE><FONT face="courier, monospaced">getAttribute</FONT></CODE> services supported
by the standard <CODE><FONT face="courier, monospaced">ServletContext</FONT></CODE>
object. This surrogate exists only to provide
application-level data sharing for older
servlet engines (prior to 2.2). Note that,
while providing a means for application-level
data sharing for older servlet engines,
such global data cannot be shared with non-Cocoon
servlets or JSP pages. For this purpose, use
the standard <CODE><FONT face="courier, monospaced">servletContext</FONT></CODE> object.
<CODE><FONT face="courier, monospaced">xspGlobal</FONT></CODE> may be deprecated in future
XSP versions
</LI>
<LI>
<CODE><FONT face="courier, monospaced">xspNodeStack</FONT></CODE>.
A <CODE><FONT face="courier, monospaced">java.util.Stack</FONT></CODE> used to control
element nesting in the XSP page <CODE><FONT face="courier, monospaced">Document</FONT></CODE>
object. Extreme caution must be exercised in
using this object as all DOM manipulations
take effect on its top element.
</LI>
<LI>
<CODE><FONT face="courier, monospaced">xspCurrentNode</FONT></CODE>.
An <CODE><FONT face="courier, monospaced">org.w3c.Node</FONT></CODE> object corresponding
to the node being currently populated
</LI>
<LI>
<CODE><FONT face="courier, monospaced">xspParentNode</FONT></CODE>.
An <CODE><FONT face="courier, monospaced">org.w3c.Node</FONT></CODE> object corresponding
to the parent of the node being currently
populated. This object is normally the top element
of the <CODE><FONT face="courier, monospaced">xspNodeStack</FONT></CODE>
</LI>
<LI>
<CODE><FONT face="courier, monospaced">xspParser</FONT></CODE>.
A Cocoon-supplied DOM parser which may be used
to create new documents and parse external
XML documents
</LI>
</UL></BLOCKQUOTE>
<P align="justify">
In addition to the above objects, the <CODE><FONT face="courier, monospaced">XSPPage</FONT></CODE>
contains an <CODE><FONT face="courier, monospaced">xspExpr()</FONT></CODE> method than can be
used to wrap any Java value as an <CODE><FONT face="courier, monospaced">org.w3c.Text</FONT></CODE>
object. Example:
</P>
<DIV align="center"><TABLE border="0" cellpadding="0" cellspacing="4"><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#ffffff"><PRE>xspCurrentElement.appendChild(
document.createTextNode("It's now ")
);
xspCurrentElement.appendChild(
xspExpr(new Date())
);
</PRE></TD><TD bgcolor="#0086b2" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR><TR><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD bgcolor="#0086b2" height="1" width="1"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD></TR></TABLE></DIV>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>The XSP Util Class</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="95%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
In addition to the above infrastructure objects and methods,
XSP provides a utility class offering a number of DOM, HTTP
and file manipulation services implemented as public
static methods:
</P>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>DOM Utility Methods</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced">Node cloneNode(Node node, Document factory)</FONT></CODE>.<BR>
This method performs a deep copy of its <CODE><FONT face="courier, monospaced">node</FONT></CODE>
argument using the <CODE><FONT face="courier, monospaced">factory</FONT></CODE> document as the
creator for the copied nodes. This is typically used to
embed external XML documents into the XSP page
<CODE><FONT face="courier, monospaced">document</FONT></CODE> object. This is required because
DOM Level 1 parsers do not allow for a node to be
appended as child to another node if the two belong
to different document instances
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String toMarkup(Node node)</FONT></CODE>.<BR>
This method generates an indented String representation
of its <CODE><FONT face="courier, monospaced">node</FONT></CODE> argument. This is typically
used to embed a textual, non-DOM representation of
external XML files as well as for debugging purposes
</LI>
</UL></BLOCKQUOTE>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>HTTP Utility Methods</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced">String encodeMarkup(String string)</FONT></CODE>.<BR>
This method scans its <CODE><FONT face="courier, monospaced">string</FONT></CODE> argument
replacing occurrences of markup delimiters as
follows:<BR>
1) <CODE><FONT face="courier, monospaced"><</FONT></CODE> is replaced by <CODE><FONT face="courier, monospaced">&lt;</FONT></CODE><BR>
2) <CODE><FONT face="courier, monospaced">></FONT></CODE> is replaced by <CODE><FONT face="courier, monospaced">&gt;</FONT></CODE><BR>
3) <CODE><FONT face="courier, monospaced">&</FONT></CODE> is replaced by <CODE><FONT face="courier, monospaced">&amp;</FONT></CODE><BR>
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String formEncode(String text)</FONT></CODE>.<BR>
This method converts its <CODE><FONT face="courier, monospaced">text</FONT></CODE> argument
to <I>x-www-form-urlencode</I> format, as required
by HTTP form query strings. This method is actually
a wrapper for <CODE><FONT face="courier, monospaced">java.net.URLEncoder.encode</FONT></CODE>
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String formDecode(String text)</FONT></CODE>.<BR>
This method converts its <CODE><FONT face="courier, monospaced">text</FONT></CODE> argument
from <I>x-www-form-urlencode</I> format to a
<CODE><FONT face="courier, monospaced">String</FONT></CODE> representation. This method is
actually a wrapper for
<CODE><FONT face="courier, monospaced">java.net.URLDecoder.decode</FONT></CODE> (introduced
in Java2) and exists solely to provide this
functionality for JDK1.1
</LI>
</UL></BLOCKQUOTE>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>File Utility Methods</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced">String pathComponent(String filename)</FONT></CODE>.<BR>
This method interprets its <CODE><FONT face="courier, monospaced">filename</FONT></CODE>
argument as a file name and removes the last
component to yield only the directory path
information.
This conversion is performed in an operating
system-independent manner
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String fileComponent(String filename)</FONT></CODE>.<BR>
This method interprets its <CODE><FONT face="courier, monospaced">filename</FONT></CODE>
argument as a file name and removes the leading
path component to yield only the file name
portion, including the file name extension,
if any.
This conversion is performed in an operating
system-independent manner
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String baseName(String filename)</FONT></CODE>.<BR>
This method interprets its <CODE><FONT face="courier, monospaced">filename</FONT></CODE>
argument as a file name and removes the leading
path component to yield only the base file name
<I>excluding</I> the last <I>dot</I> file
extension, if any.
This conversion is performed in an operating
system-independent manner
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String baseName(String filename, String suffix)</FONT></CODE>.<BR>
This method interprets its <CODE><FONT face="courier, monospaced">filename</FONT></CODE>
argument as a file name and removes the leading
path component to yield only the base file name
<I>excluding</I> the last occurerence of the
extension given by its
<CODE><FONT face="courier, monospaced">suffix</FONT></CODE> argument.
This conversion is performed in an operating
system-independent manner
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String normalizedBaseName(String filename)</FONT></CODE>.<BR>
This method interprets its <CODE><FONT face="courier, monospaced">filename</FONT></CODE>
argument as a file name and removes the leading
path component to yield only the base file name
<I>excluding</I> the last <I>dot</I> file
extension, if any. The resulting filename is
then scanned for non-alphanumeric characters
which are replaced by <I>underscore</I>
(<CODE><FONT face="courier, monospaced">_</FONT></CODE>). An underscore is also
preprended to each directory component.
This is used to map file names to valid Java
identifiers.
This conversion is performed in an operating
system-independent manner
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String relativeFilename(String filename, HttpServletRequest request, ServletContext context)</FONT></CODE>.<BR>
This method is used to build a fully qualified pathname
for a <CODE><FONT face="courier, monospaced">filename</FONT></CODE> relative to the <CODE><FONT face="courier, monospaced">request</FONT></CODE>
URI. This is typically used to open operating system files
given a name relative to the request's virtual path
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String relativeFilename(String filename, HttpServletRequest request)</FONT></CODE>.<BR>
This method is used to build a fully qualified pathname
for a <CODE><FONT face="courier, monospaced">filename</FONT></CODE> relative to the <CODE><FONT face="courier, monospaced">request</FONT></CODE>
URI. This is typically used to open operating system files
given a name relative to the request's virtual path. This
variant depends on the deprecated
<CODE><FONT face="courier, monospaced">HttpServletRequest.getRealPath</FONT></CODE> method and
exists only for compatibility with older JSDK's in which
the <CODE><FONT face="courier, monospaced">ServletContext</FONT></CODE> object did not provide
a <CODE><FONT face="courier, monospaced">getRealPath()</FONT></CODE> method
</LI>
</UL></BLOCKQUOTE>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="-1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>String Utility Methods</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="90%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<BLOCKQUOTE><UL>
<LI>
<CODE><FONT face="courier, monospaced">String[] split(String line)</FONT></CODE>.<BR>
This method converts its <CODE><FONT face="courier, monospaced">line</FONT></CODE> string
argument to a <CODE><FONT face="courier, monospaced">String</FONT></CODE> array using
whitespace (blanks, tabs, carriage returns and
newlines) as field separators
</LI>
<LI>
<CODE><FONT face="courier, monospaced">String[] split(String line, String delimiter)</FONT></CODE>.<BR>
This method converts its <CODE><FONT face="courier, monospaced">line</FONT></CODE> string
argument to a <CODE><FONT face="courier, monospaced">String</FONT></CODE> array using
the characters in its <CODE><FONT face="courier, monospaced">delimiter</FONT></CODE>
argument as field separators
</LI>
<LI>
<CODE><FONT face="courier, monospaced">boolean isAlphaNumeric(char c)</FONT></CODE>.<BR>
This method tests its <CODE><FONT face="courier, monospaced">c</FONT></CODE> argument to
assert whether it is an underscore, a lowercase or
uppercase letter or a digit
</LI>
</UL></BLOCKQUOTE>
</FONT></TD></TR></TABLE></DIV><BR>
</FONT></TD></TR></TABLE></DIV><BR>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Other Scripting Languages</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
XSP has been designed to support other scripting
languages, in addition to Java. In principle, any
programming language for which a Java-based
interpreter exists could be used to script
XSP pages.
</P>
<P align="justify">
In general, languages supporting compilation to
bytecodes, such as Java itself, Netscape's
<A href="http://www.mozilla.org/rhino/">Rhino Javascript</A>
or IBM's
<A href="http://www2.hursley.ibm.com/netrexx/">NetRexx</A>,
perform significantly better than interpreted
languages like
<A href="http://home.worldcom.ch/jmlugrin/fesi/">FESI Javascript</A>
or
<A href="http://www.research.digital.com/SRC/WebL/">WebL</A>.
</P>
<P align="justify">
Interpreted languages, however, are expected to
play an important role in XSP scripting.
This is so because (in addition to their typical
ease of use) more and more field-specialized
languages are being developed for the JVM.
Such specialized scripting languages usually
offer more expressive power and conciseness
than strictly object-oriented languages.
</P>
<P align="justify">
For a fairly complete list of such languages
see
<A href="http://grunge.cs.tu-berlin.de/~tolk/vmlanguages.html">Programming Languages for the Java Virtual Machine</A>.
</P>
<P align="justify">
Until recently, Java lacked a well-defined
scripting architecture that allowed applications
to incorporate scripting easily.
IBM's
<A href="http://www.alphaworks.ibm.com/tech/bsf">Bean Scripting Framework</A>
(BSF) is an Alphaworks project providing such architecture.
</P>
<P align="justify">
BSF supports a growing number of
scripting languages including
<A href="http://www.mozilla.org/rhino/">Rhino</A>,
<A href="http://www2.hursley.ibm.com/netrexx/">NetRexx</A>,
<A href="http://www.scriptics.com/java">Jacl</A>
and
<A href="http://www.jpython.org">JPython</A>.
On the Windows platform,
BSF also supports
<A href="http://msdn.microsoft.com/scripting/default.htm?/scripting/jscript/default.htm">JScript</A>,
<A href="http://msdn.microsoft.com/scripting/default.htm?/scripting/vbscript/default.htm">VBScript</A>,
and
<A href="http://www.activestate.com/activeperl">PerlScript</A>.
</P>
<P align="justify">
Currently, XSP only supports Java as a scripting language,
though its design allows for an easy integration of
other languages.
</P>
<P align="justify">
In the near future, BSF will be integrated to XSP's own
language abstraction mechanism so that most (if not all)
of the above mentioned languages may become available
for XSP scripting.
</P>
<P align="justify">
XSP tag libraries are language-dependent. Thus, the
addition of a new language involves (at the very
least) porting the XSP built-in libraries. An XSP library is
composed of a code-generation XSLT sylesheet and an
optional <I>library preprocessor</I> class.
</P>
<P align="justify">
A library's code-generation stylesheet is simply a
"regular" XSLT stylesheet responsible for translating
user-defined dynamic tags into equivalent XSP tags
for a given scripting language (sometimes called <I>logicsheet</I>).
While a preprocessor is an optional library Java class
used to augment an XSP page DOM tree prior to
applying the library code-generation stylesheet.
</P>
<P align="justify">
Library preprocessors <I>may</I> be
language-dependent. Early experience
suggests, though, that the same preprocessor
class will be typically shared by different
languages for the same dynamic tagset.
</P>
<P align="justify">
XSLT <I>extension functions</I> and
<I>extension elements</I> may replace
library preprocessors in the future. In
this case, all code-generation logic would
reside in the library's stylesheet.
</P>
<P align="justify">
At this early development stage, we still don't know how the
implementation will evolve and we look forward for public feedback
before going any further along with the implementation details.
</P>
</FONT></TD></TR></TABLE></DIV><BR>
<DIV align="right"><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD align="right" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-top.gif"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="1"></TD><TD align="left" height="7" valign="bottom" width="9"><IMG border="0" height="7" hspace="0" src="resources/bar-top-right.gif" vspace="0" width="9"></TD></TR><TR><TD background="resources/bar-border-left.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD><TD bgcolor="#0086b2" width="100%"><FONT color="#ffffff" face="arial,helvetica,sanserif" size="+1"><IMG border="0" height="5" hspace="0" src="resources/void.gif" vspace="0" width="5"><B>Acknowledgements</B></FONT></TD><TD background="resources/bar-border-right.gif" width="9"><IMG border="0" height="1" hspace="0" src="resources/void.gif" vspace="0" width="9"></TD></TR><TR><TD align="right" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-left.gif" vspace="0" width="9"></TD><TD background="resources/bar-border-bottom.gif"><IMG border="0" height="12" hspace="0" src="resources/void.gif" vspace="0"></TD><TD align="left" height="12" valign="top" width="9"><IMG border="0" height="12" hspace="0" src="resources/bar-bottom-right.gif" vspace="0" width="9"></TD></TR></TABLE><TABLE border="0" cellpadding="0" cellspacing="0" width="98%"><TR><TD><FONT color="#000000" face="arial,helvetica,sanserif">
<P align="justify">
This initial implementation of XSP has
been developed by
<A href="http://www.exolab.org/">Exolab</A>
and is being donated to the
Apache project as part of Exoffice's
commitment to the open source movement.
</P>
<P align="justify">
Special thanks must be given to
<A href="mailto:ghalimi@exoffice.com">Ismael Ghalimi</A>
for sponsoring and supporting XSP development.
</P>
<P align="justify">
Last, but not least, cheers to
<A href="mailto:stefano@apache.org">Stefano Mazzocchi</A>,
founder and leader of the Cocoon project and original author of
the XSP specification. Thanks!!!
</P>
</FONT></TD></TR></TABLE></DIV><BR>
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Copyright © 1999-2000 The Apache Software Foundation.
All Rights Reserved.
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