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<h1>22. Virtuoso Functions Guide - xmlview</h1>
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<div id="text">
<h2>xmlview</h2>
<div class="refpurpose">Returns the xml document corresponding to given XML view </div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">xmlview</span>
</span>
(<span class="paramdef">in <span class="parameter">view_name</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
The function returns the output produced by an XML view as it was a
content of some XML document accessed via document() XPath function.
The result of the function call may be used as input of some path expression
that select interesting parts of the full output of the XML view.
The XQuery engine will translate the XPath expression into SQL statement
in order to avoid redundant data access and to build whole XML tree.
</p>
<p>This function may be used only in the header of FOR operator of XQuery.
To specify the list of values of a variable, a path expression may be used that
starts with the call of xmlview() function.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">view_name – </span>
The name of xml view</div>
</div>
<div class="refsect1">
<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="err37000" />
<span class="errorcode">37000</span>
</td>
<td class="data">
<a name="err " />
<span class="errorcode"> </span>
</td>
<td class="data">
<span class="errorname">Unknown view name is passed as argument of xmlview()</span>
</td>
<td class="data"> </td>
</tr>
</table>
<br />
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<a name="xpf_ex_xmlview" />
<div class="example">
<div class="exampletitle" />
<p>The XQUERY expressions below are queries to the following XML view: </p>
<div>
<pre class="screen">
create xml view "cat" as
{
"Demo"."demo"."Categories" c as "category" ("CategoryID", "Description" as "description")
{
"Demo"."demo"."Products" p as "product" ("ProductName")
on (p."CategoryID" = c."CategoryID")
}
};
</pre>
</div>
<p>
The first query returns all products with the attribute ProductName starting with "L".
The second query returns categories with attribute CategoryID less than 10.
</p>
<div>
<pre class="screen">
for $r in xmlview("cat")//product[@ProductName like "L%"] return $r
for $r in xmlview("cat")/category[@CategoryID<"10"] return $r
</pre>
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