On Tue, Jun 22, 2010 at 2:03 PM, Adrian Herscu <adrian.her...@gmail.com> wrote:
> 1. xsl variables:
>
> <xsl:variable name="sections" select="descendant::section" />
>
> and then use this XPath expression instead
>
> xalan:nodeset($sections)[utils:dummy(true())][1]
>
> then the dummy() function will be called 4 times (while the output xml will
> remain the same) !
I'm tempted to imagine, that Xalan might be trying to do as following
(written as pseudo-code), for the above case:
$node-set := xalan:nodeset($sections)
for each node in $node-set do
apply the filter [utils:dummy(true())][1] to the node in the node-set
done
Which I think will likely cause the expression, utils:dummy(true()) to
be evaluated as many times as the number of nodes in the node-set.
I think, to be able to evaluate utils:dummy(true()) only once, the
processor needs to do some hard static analysis of the expression,
which could an implementation constraint.
--
Regards,
Mukul Gandhi
