Hi,
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
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