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Re: processin each element not on a list
- From: Jeni Tennison <jeni at jenitennison dot com>
- To: Dan Diebolt <dandiebolt at yahoo dot com>
- Cc: xsl-list at lists dot mulberrytech dot com
- Date: Sat, 5 Oct 2002 13:36:24 +0100
- Subject: Re: [xsl] processin each element not on a list
- Organization: Jeni Tennison Consulting Ltd
- References: <20021005121845.86414.qmail@web80006.mail.yahoo.com>
- Reply-to: xsl-list at lists dot mulberrytech dot com
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/
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