We can make search much faster if we generate index. We generate index by using xsl:key.
<?xml version='1.0'?>
<?xml-stylesheet type="text/xsl" href="key_sample.xsl" ?>
<titles>
<book title="XML Today" author="David Perry"/>
<book title="XML and Microsoft" author="David Perry"/>
<book title="XML Productivity" author="Jim Kim"/>
</titles>
<?xml version='1.0'?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<!-- create index for book based on @author -->
<xsl:key name="title-search" match="book" use="@author"/>
<xsl:template match="/">
<HTML>
<BODY>
<!-- use index title-search to search book where index value = 'David Perry' -->
<xsl:for-each select="key('title-search', 'David Perry')">
<div>
<xsl:value-of select="@title"/>
</div>
</xsl:for-each>
</BODY>
</HTML>
</xsl:template>
</xsl:stylesheet>
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