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<h1>22. Virtuoso Functions Guide - xslt_stale</h1>
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<div id="text">
<h2>xslt_stale</h2>
<div class="refpurpose">force reload of XSL stylesheet</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">xslt_stale</span>
</span>
(<span class="paramdef">in <span class="parameter">uri</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
This function can be used to force Virtuoso to reload a cached
stylesheet from the URI when next used with
<span class="computeroutput">xslt()</span> or <span class="computeroutput">http_xslt()</span>.
Using this function before every application of the stylesheet is
extremely inefficient. If stylesheets are stored in the database, you
can use this function in an update trigger on the table storing the
stylesheets but you don't have to use it before every application of the
sheet.
</p>
<p>This function never needs to be applied to a stylesheet URI with
the file:// protocol since <span class="computeroutput">xslt()</span> and
<span class="computeroutput">http_xslt()</span> will automatically detect a stale
cache entry. However if the stylesheet is stored on a remote web
server, or if the stylesheet contains subdocuments (
e.g. external XML entities, xsl:include or xsl:import statements)
this function is needed to force a reload.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">uri – </span>
The location of the style sheet to force a reload.</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p />
</div>
<div class="refsect1title">Errors</div>
<p>The function never signals any errors.
E.g. it is not an error if the specified stylesheet does not exist
or if the specified stylesheet is used by other transaction when
the <span class="computeroutput">xslt_stale()</span> is called.
</p>
<p />
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_xslt_stale" />
<div class="example">
<div class="exampletitle">Simple Use</div>
<p />
<div>
<pre class="programlisting">
sheet := 'virt://WS.WS.SYS_DAV_RES.RES_FULL_PATH.RES_CONTENT:/DAV/stylesheets/document.xsl';
xslt_stale (sheet);
xslt(sheet, xml_doc_tree);
</pre>
</div>
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<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="fn_xslt.html">xslt()</a>
</p>
<p>
<a href="fn_http_xslt.html">http_xslt()</a>
</p>
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