J,
At 04:45 PM 11/20/2003, you wrote:
I have to do some validation in my xsl.
I'm doing the following type statement 20,000 times, and the lookup file is
around 50,000 lines of id's <id key="XXYYZZJ"/>.
<xsl:when
test="not(document('../master/ids-master.xml')/ids/id[(_at_)key=$id])">
It works for a while, then dies with an out of memory error, and it sure is
slow!
The first thing you should definitely do is collect the lookup ids into a
variable, as in
<xsl:variable name="keys"
select="document('../master/ids-master.xml')/ids/id/@key"/>
Then you can test your local ids against the keys in the variable, without
parsing your lookup file every time (which it sounds like your processor
might be doing):
<xsl:when test="not($id = $keys])">
Try that and see if it helps.
If Xalan is already optimizing the document() lookup and parse, you may get
no gain from this technique -- but there's no way it could hurt.
XSLT keys could also help, but since your keys are in a separate document
you'd have to switch contexts to use the XSLT key function, like so:
<xsl:key name="keys-by-id" match="id" use="@key"/>
<xsl:variable name="keyfile" select="document('../master/ids-master.xml')"/>
... and then
<xsl:for-each select="$keyfile">
<xsl:when test="not(key('keys-by-id', $id))">...</xsl:when>
</xsl:for-each>
but whether this helps also will depend on your processor and what kind of
smarts it has inside.
Cheers,
Wendell
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Wendell Piez
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