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<h1>22. Virtuoso Functions Guide - XMLInsertBefore</h1>
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<h2>XMLInsertBefore</h2>
<div class="refpurpose">Modify an XML document by inserting new children before the node specified by given entity.</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">XMLInsertBefore</span>
</span>
(<span class="paramdef">inout <span class="parameter">source</span> any</span>,
<span class="paramdef">in <span class="parameter">insertion1</span> any</span>,
<span class="paramdef">in <span class="parameter">insertion2</span> any</span>,
<span class="paramdef">
<span class="parameter">...</span>
</span>,
<span class="paramdef">in <span class="parameter">insertionN</span> any</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>The function modifies the XML document of the given <span class="computeroutput">source</span> XML tree entity by adding new siblings to
the node specified by the entity. Siblings will be added right before the node.
The <span class="computeroutput">source</span> entity should be XML tree entity, not "persistent XML" entity.
The value of <span class="computeroutput">source</span> should be a node entity;
<span class="computeroutput">source</span> can not be an attribute entity or a root entity.
</p>
<p>
The values passed in parameters <span class="computeroutput">insertion1</span>... <span class="computeroutput">insertionN</span> will be converted into
XML nodes according to rules described in section <a href="xmldom.html#xmldomtypecasting">Composing Document Fragments From DOM Function Arguments.</a>
</p>
<p>
After calling the function, parameter <span class="computeroutput">source</span> is still a valid XML entity that points to the same node.
The value passed as <span class="computeroutput">source</span> can be used in the rest of caller procedure.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">source – </span>
The XML tree entity whose document should be modified.
This document should not be locked (see <a href="xmldom.html">Changing XML Entities in DOM Style</a> for details).
</div>
<div class="refsect2">
<span class="refsect2title">parameterI – </span>
The value to be added as as child node of <span class="computeroutput">source</span>.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>The function returns NULL.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_XMLInsertBefore" />
<div class="example">
<div class="exampletitle">XMLInsertBefore in a Virtuoso/PL procedure</div>
<p>The sample procedure contains two calls of <span class="computeroutput">XMLInsertBefore</span>.
First call insert two new element nodes just before the given node; second call demonstrates how text nodes can be merged.</p>
<div>
<pre class="screen">
create procedure XMLInsertBefore_demo()
{
declare DESCRIPTION varchar (40);
declare ENTITY, ent any;
result_names (DESCRIPTION, ENTITY);
result ('EXAMPLE1', 'Plain inserting of some children');
ent := xpath_eval ('//child0', xtree_doc ('<a><child0></child0></a>'));
result ('The document to modify', xpath_eval ('/', ent));
result ('The place of insertion', ent);
XMLInsertBefore (ent, xtree_doc ('<child1/>'), xtree_doc ('<child2/>'));
result ('The changed document', xpath_eval ('/', ent));
result ('The original node is updated', ent);
result ('EXAMPLE2', 'Insertion that cause concatenation of text nodes');
ent := xpath_eval ('//b/text()', xtree_doc ('<a><b>world!</b></a>'));
result ('The document to modify', xpath_eval ('/', ent));
result ('The place of insertion', ent);
XMLInsertBefore (ent, 'Hello, ');
result ('The changed document', xpath_eval ('/', ent));
result ('The original node is updated', ent);
}
Done. -- 00000 msec.
XMLInsertBefore_demo()
DESCRIPTION ENTITY
VARCHAR VARCHAR
_______________________________________________________________________________
EXAMPLE1 Plain inserting of some children
The document to modify <a><child0 /></a>
The place of insertion <child0 />
The changed document <a><child1 /><child2 /><child0 /></a>
The original node is updated <child0 />
EXAMPLE2 Insertion that cause concatenation of text nodes
The document to modify <a><b>world!</b></a>
The place of insertion world!
The changed document <a><b>Hello, world!</b></a>
The original node is updated Hello, world!
10 Rows. -- 00000 msec.
</pre>
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<div class="refsect1title">See Also</div>
<p>
<a href="fn_XMLReplace.html">XMLReplace</a>
</p>
<p>
<a href="fn_XMLAddAttribute.html">XMLAddAttribute</a>
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<p>
<a href="fn_XMLAppendChildren.html">XMLAppendChildren</a>
</p>
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<a href="fn_XMLInsertAfter.html">XMLInsertAfter</a>
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