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<h1>22. Virtuoso Functions Guide - xml_namespace_scope</h1>
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<div id="text">
<h2>xml_namespace_scope</h2>
<div class="refpurpose">Returns a vector of all namespace declarations in all ancestors of the given XML entity.</div>
<div class="funcsynopsis">
<span class="funcdef">vector <span class="function">xml_namespace_scope</span>
</span>
(<span class="paramdef">in <span class="parameter">ent</span> XML Entity</span>,
<span class="paramdef">in <span class="parameter">use_default_ns</span> integer</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>The function returns a vector of even length that consists of all declared namespace prefixes and namespace URIs
from the <span class="computeroutput">ent</span> 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.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">ent – </span>
The entity to process.
</div>
<div class="refsect2">
<span class="refsect2title">use_default_ns – </span>
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.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>The function returns a vector of even length that contains narrow strings in UTF-8 encoding.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_xml_namespace_scope" />
<div class="example">
<div class="exampletitle">Adding namespace declarations to the XPath expression</div>
<p>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.</p>
<div>
<pre class="screen">
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
</pre>
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<div class="refsect1title">See Also</div>
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<a href="fn_xpath_eval.html">xpath_eval</a>
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