Hi Dan,
I have xml in substantially the following form:
<root>
<choices>
<choice>A</choice>
<choice>B</choice>
<choice>C</choice>
<choice>D</choice>
</choices>
<items>
<item id="1">A</item>
<item id="2">X</item>
<item id="3">B</item>
<item id="4">C</item>
<item id="5">Y</item>
<item id="6">Z</item>
</item>
</root>
I need to process each item where its content is not one of the
choice values. I need a very efficient solution since I have say
up to 10,000 <items>s and perhaps 100 difference <choice>'s.
OK, then I think you should set up a key on the choices so that, given
an item value, you can quickly see whether it's on the list of choices
by looking up the key:
<xsl:key name="choices" match="choice" use="." />
Then, in order to select all the items whose content is *not* one of
the choice items, you can find those items that don't return a node
when you use the key to do the lookup:
/root/items/item[not(key('choices', .))]
Cheers,
Jeni
---
Jeni Tennison
http://www.jenitennison.com/
XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list