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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] xsl:key on part of a document in XSLT2.0?
 I am writing XSLT 1.0 stylesheets over a year now and was wondering if the following is possible in XSLT 2.0: Applying a key to only part of a document. For example: Let's say I do a for-each on each child of a node "$node1" and then check if a "$node2" has any child with the same id... <xsl:template name="compare">
<xsl:param name="node1"/>
<xsl:param name="node2"/>
<xsl:for-each select="$node1/e">
<xsl:variable name="id1" select="@id"/>
<xsl:variable name="n2" select="$node2/e[@id = $id1]"/> //can be slow
//do something with node2
</xsl:for-each>
</xsl:template>Now this code can be quite slow if there are thousands of nodes under $node2 or $node1. The complexity would be O(N*K) where N = number of children of $node1 and K = number of children of $node2. If I could use a key then complexity could be O(N*log(K)). xsl:key would be also very usefull if it could be created dynamically inside a template... The code could look something like this: <xsl:template name="compare"> <xsl:param name="node1"/> <xsl:param name="node2"/> <xsl:key name="nodes" match="$node2/e" use="@id"/> <xsl:for-each select="$node1/e"> <xsl:variable name="id1" select="@id"/> <xsl:variable name="n2" select="key('nodes',$id1)"/> //fast //do something with node2 </xsl:for-each> </xsl:template> Of course I can use extension functions to implement my own key (using java.lang.Map), but is there any other solution for this common problem? greetings, Len Feremans _________________________________________________________________ Get today's hot entertainment gossip http://movies.msn.com/movies/hotgossip?icid=T002MSN03A07001 
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