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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.7 $ -->
<refentry xml:id='function.xslt-set-scheme-handlers' xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>xslt_set_scheme_handlers</refname>
<refpurpose>Set the scheme handlers for the XSLT processor</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>void</type><methodname>xslt_set_scheme_handlers</methodname>
<methodparam><type>resource</type><parameter>xh</parameter></methodparam>
<methodparam><type>array</type><parameter>handlers</parameter></methodparam>
</methodsynopsis>
<para>
Registers the scheme handlers (XPath handlers) for the document.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>xh</parameter></term>
<listitem>
<para>
The XSLT processor link identifier, created with
<function>xslt_create</function>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>handlers</parameter></term>
<listitem>
<para>
An array with the following keys: "get_all", "open", "get", "put",
and "close".
</para>
<para>
Every entry must be a function name or an array in the following
format: array($obj, "method").
</para>
<para>
Note that the given array does not need to contain all of the
different scheme handler elements (although it can), but it only needs
to conform to the "handler" => "function" format described above.
</para>
<para>
Each of the individual scheme handler functions called are in the
formats below:
<screen>
<![CDATA[
string get_all(resource processor, string scheme, string rest)
resource open(resource processor, string scheme, string rest)
int get(resource processor, resource fp, string &data)
int put(resource processor, resource fp, string data)
void close(resource processor, resource fp)
]]>
</screen>
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
&return.void;
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>xslt_set_scheme_handlers</function> example</title>
<para>
For example, here is an implementation of the "file_exists()" PHP function.
</para>
<programlisting role="php">
<![CDATA[
<?php
// Definition of the handler
function mySchemeHandler($processor, $scheme, $rest)
{
$rest = substr($rest,1); // to remove the first / automatically added by the engine
if ($scheme == 'file_exists') {
// result is embedded in a small xml string
return '<?xml version="1.0" encoding="UTF-8"?><root>' . (file_exists($rest) ? 'true' : 'false') . '</root>';
}
}
$SchemeHandlerArray = array('get_all' => 'mySchemeHandler');
// Start the engine
$params = array();
$xh = xslt_create();
xslt_set_scheme_handlers($xh, $SchemeHandlerArray);
$result = xslt_process($xh, "myFile.xml", "myFile.xsl", NULL, array(), $params);
xslt_free($xh);
echo $result;
?>
]]>
</programlisting>
<para>
Then, inside the stylesheet, you can test whether a certain file exists with:
</para>
<programlisting role="xml">
<![CDATA[
<xsl:if test="document('file_exists:anotherXMLfile.xml')/root='true'">
<!-- The file exist -->
</xsl:if>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>xslt_set_scheme_handler</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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