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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_xml_namespace_scope">
<refmeta>
<refentrytitle>xml_namespace_scope</refentrytitle>
<refmiscinfo>xml</refmiscinfo>
</refmeta>
<refnamediv>
<refname>xml_namespace_scope</refname>
<refpurpose>Returns a vector of all namespace declarations in all ancestors of the given XML entity.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_xml_namespace_scope">
<funcprototype id="fproto_xml_namespace_scope">
<funcdef>vector <function>xml_namespace_scope</function></funcdef>
<paramdef>in <parameter>ent</parameter> XML Entity</paramdef>
<paramdef>in <parameter>use_default_ns</parameter> integer</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_xml_namespace_scope">
<title>Description</title>
<para>The function returns a vector of even length that consists of all declared namespace prefixes and namespace URIs
from the <code>ent</code> and all its ancestors. This information is needed for processing XML documents that
contains a mix of data and XPath expressions, such as BPEL documents.</para>
</refsect1>
<refsect1 id="params_xml_namespace_scope">
<title>Parameters</title>
<refsect2><title>ent</title>
<para>The entity to process.</para>
</refsect2>
<refsect2><title>use_default_ns</title>
<para>Flags if the resulting array should contain declarations of default namespace. If it is zero then
only declarations of namespace prefixes are listed; if non-zero then all declarations are listed.</para>
</refsect2>
</refsect1>
<refsect1 id="ret_xml_namespace_scope"><title>Return Types</title>
<para>The function returns a vector of even length that contains narrow strings in UTF-8 encoding.</para>
</refsect1>
<!--
<refsect1 id="errors_xml_namespace_scope">
<title>Errors</title>
<para>This function can generate the following errors:</para>
<errorcode></errorcode>
</refsect1>
-->
<refsect1 id="examples_xml_namespace_scope">
<title>Examples</title>
<example id="ex_xml_namespace_scope"><title>Adding namespace declarations to the XPath expression</title>
<para>The function gets an entity whose string-value is an XPATH expression and returns
the text of expression with all namespace declarations that are in scope. The resulting expression is
context-independent. This is useful for BPEL-like applications and for extracting XPATH expressions from
XML Schema documents.</para>
<screen><![CDATA[
create procedure xpath_add_namespace_scope (in ent any, in use_default_ns integer)
{
declare _expn varchar;
declare _ses any;
declare _scope any;
declare _ctr any;
_expn := charset_recode (xpath_eval ('string(.)', ent), '_WIDE_', 'UTF-8');
_scope := xml_namespace_scope (ent, use_default_ns);
_ctr := length (_scope);
if (_ctr = 0)
return _expn;
_ses := string_output ();
http ('[', _ses);
while (_ctr > 0)
{
if (_scope[_ctr-2] = '')
http (sprintf (' xmlns="%s"', _scope[_ctr-1]), _ses);
else
http (sprintf (' xmlns:%s="%s"', _scope[_ctr-2], _scope[_ctr-1]), _ses);
_ctr := _ctr - 2;
}
http (' ] ', _ses);
http (_expn, _ses);
return string_output_string (_ses);
}
select xpath_add_namespace_scope (
xquery_eval (
'declare namespace xsd="http://www.w3.org/2001/XMLSchema";
//xsd:keyref[@name="ISBNnumber"]/xsd:field/@xpath',
xtree_doc (
'<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://www.publishing.org"
xmlns="http://www.publishing.org">
<xsd:element name="Book" minOccurs="1" maxOccurs="unbounded">
<xsd:keyref name="ISBNnumber" refer="BookDB_ISBN">
<xsd:selector xpath="."/>
<xsd:field xpath="ISBN"/>
</xsd:keyref>
</xsd:element>
<!-- The rest of the XML Schema file is skipped -->
</xsd:schema>')),
1 );
callret
VARCHAR
_______________________________________________________________________________
[ xmlns="http://www.publishing.org" xmlns:xsd="http://www.w3.org/2001/XMLSchema" ] ISBN
]]>
</screen>
</example>
</refsect1>
<refsect1 id="seealso_xml_namespace_scope">
<title>See Also</title>
<para><link linkend="fn_xpath_eval"><function>xpath_eval</function></link></para>
</refsect1>
</refentry>
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