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<h1>22. Virtuoso Functions Guide - XMLCONCAT</h1>
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<div id="text">
<h2>XMLCONCAT</h2>
<div class="refpurpose">Creates a forest of elements by concatenating a list of XML values</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">XMLCONCAT</span>
</span>
(<span class="paramdef">
<span class="parameter">value_expr1</span> varchar</span>,
<span class="paramdefoptional">[<span class="optional">value_expr2</span> varchar]</span>,
<span class="paramdefoptional">[<span class="optional">...</span>]</span>,
<span class="paramdefoptional">[<span class="optional">value_exprN</span> varchar]</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
<span class="computeroutput">XMLCONCAT</span> accepts a list of XML value expressions as its arguments, and produces a forest of elements by
concatenating the XML values that are returned from the same row to make one value.
<span class="computeroutput">XMLCONCAT</span> works like <span class="computeroutput">XMLFOREST</span>,
except that <span class="computeroutput">XMLCONCAT</span> parameters is a list of XML elements.
Null expressions are dropped from the result. If all the value expressions are null, then the function returns NULL.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">value_expr1 – </span>
a vector returned by <span class="computeroutput">XMLELEMENT</span>, <span class="computeroutput">XMLFOREST</span>,
or <span class="computeroutput">XMLCONCAT</span> functions, or an entity object returned by
corresponding functions (e.g. <span class="computeroutput">xtree_doc</span>, <span class="computeroutput">xquery_eval</span> or <span class="computeroutput">path_eval</span>).
In the latter case the entity object must not be an attribute.
</div>
</div>
<div class="refsect1title">Errors</div>
<table class="data">
<tr>
<th class="data">SQLState</th>
<th class="data">Error Code</th>
<th class="data">Error Text</th>
<th class="data">Description</th>
</tr>
<tr>
<td class="data">
<a name="err22003" />
<span class="errorcode">22003</span>
</td>
<td class="data">
<a name="errSR355" />
<span class="errorcode">SR355</span>
</td>
<td class="data">
<span class="errorname">Too few arguments for XMLCONCAT</span>
</td>
<td class="data">There must be at least one argument</td>
</tr>
<tr>
<td class="data">
<a name="err22003" />
<span class="errorcode">22003</span>
</td>
<td class="data">
<a name="errSR359" />
<span class="errorcode">SR359</span>
</td>
<td class="data">Invalid argument type NVARCHAR (225) for arg N to XMLCONCAT</td>
<td class="data">The entity object returned by xpath_eval must not be an attribute</td>
</tr>
<tr>
<td class="data">
<a name="err22003" />
<span class="errorcode">22003</span>
</td>
<td class="data">
<a name="errSR360" />
<span class="errorcode">SR360</span>
</td>
<td class="data">XMLCONCAT doesn't concatenate attributes</td>
<td class="data">The entity object returned by xquery_eval must not be an attribute</td>
</tr>
</table>
<br />
<p />
<p />
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_XMLCONCAT" />
<div class="example">
<div class="exampletitle">XMLCONCAT() with two parameters</div>
<p>
The following example produces an XML elements for the 'FName', 'LName', 'country' and
'nationality', concatenates the result, and creates a one-column result set:
</p>
<div>
<pre class="screen">
select XMLCONCAT (
XMLELEMENT ('FName', "FirstName"),
XMLELEMENT ('LName', "LastName"),
xquery_eval('//country', xtree_doc('<a><country>USA</country></a>')),
xpath_eval('//nationality', xtree_doc('<a><nationality>RUSSIAN</nationality></a>')))
from "Demo"."demo"."Employees";
callret
VARCHAR
_______________________________________________________________________________
<FName>Nancy</FName><LName>Davolio</LName><country>USA</country><nationality>RUSSIAN</nationality>
<FName>Andrew</FName><LName>Fuller</LName><country>USA</country><nationality>RUSSIAN</nationality>
. . .
<FName>Anne</FName><LName>Dodsworth</LName><country>USA</country><nationality>RUSSIAN</nationality>
9 Rows.
</pre>
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<a href="fn_XMLAGG.html">XMLAGG()</a>
</p>
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<a href="fn_XMLATTRIBUTES.html">XMLATTRIBUTES()</a>
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