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<h1>22. Virtuoso Functions Guide - XMLType.extract</h1>
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<div id="text">
<h2>XMLType.extract</h2>
<div class="refpurpose">Evaluates given XPATH expression.</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">XMLType.extract</span>
</span>
(<span class="paramdef">in <span class="parameter">xpath_expn</span> varchar</span>,
<span class="paramdefoptional">[in <span class="optional">namespace_map</span> varchar]</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>The member function calculates the given XPATH expression <span class="computeroutput">xpath_expn</span> using
the XML entity of the instance as a context node. If a <span class="computeroutput">namespace_map</span> parameter
is given then the function adds namespace declarations from this parameter into the beginning of
<span class="computeroutput">xpath_expn</span> before the evaluation.
The function returns the first result of the XPATH evaluation or NULL if there are no results.
If the result is an XML entity then it is converted into a non-schema based instance of XMLType.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">xpath_expn – </span>
A text of XPATH expression to evaluate.
</div>
<div class="refsect2">
<span class="refsect2title">namespace_map – </span>
A string that is a list of namespace prefix declarations delimited by whitespace characters.
If the <span class="computeroutput">xpath_expn</span> expression also contains a list of declarations then these two
lists are concatenated.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>The function returns a non-schema based XMLType instance, NULL or a value of any other type</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_XMLType.extract" />
<div class="example">
<div class="exampletitle">A table with an XMLType column</div>
<p>This populates a table with XML data and then selects 'ename' element from the appropriate record.</p>
<div>
<pre class="screen">
create table TEST_XMLS (I integer primary key, XMLVAL XMLType);
insert into TEST_XMLS values (1, XMLType('<emp><empno>221</empno><ename>John</ename></emp>'));
insert into TEST_XMLS values (2, XMLType('<po><pono>331</pono><poname>PO_1</poname></po>'));
insert into TEST_XMLS values (3, XMLType('<oil-rig id="14a" water="0.413"/><oil-rig id="14b" water="0.402"/>'));
select e.XMLVAL.extract ('//ename').getCLobVal() as ENAME
from TEST_XMLS as e
where e.XMLVAL.existsNode('/emp/empno')
ENAME
NVARCHAR
_______________________________________________________________________________
<ename>John</ename>
1 Rows. -- 00000 msec.
</pre>
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<div class="refsect1title">See Also</div>
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<a href="fn_XMLType.existsNode.html">XMLType.existsNode()</a>
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