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Re: [xsl] XPath shorthand


Subject: Re: [xsl] XPath shorthand
From: Ihe Onwuka <ihe.onwuka@xxxxxxxxxxxxxx>
Date: Wed, 22 Aug 2012 14:22:15 +0100

On Tue, Aug 21, 2012 at 8:28 PM, Andrew Welch <andrew.j.welch@xxxxxxxxx> wrote:
>>>>> In the end I went with
>>>>>
>>>>> <xsl:key name="desired_fields"
>>>>> match="m__id[1]|m__name[1]|m__path[1]|m__enabled[1]"
>>>>> use="local-name()"/>
>>>>>
>>>>> and
>>>>>
>>>>> following-sibling::*[key('desired_fields',local-name())]
>>>
>>> Why do that?
>>>
>>
>> Because then all my end-user has to do if he wants to change the
>> fields being retrieved is add (or subtract) the relevant element name
>> from the match pattern.
>
> ..in which case:
>
> <xsl:variable name="names" select="('m__id', 'm__name',
> 'm__path'....)" as="xs:string+"/>
>
> with
>
> following-sibling::*[local-name() = $names]
>

Yes I didn't think of this but there are two things.

This won't work in a template match on XSLT 1.0 and it is hiding
multiple comparisons under the innocent looking equality general
comparison which may bite on large volumes.

Unfortunately I don't have the volume of data to benchmark the keys
solution vs the variable solution.

 I presume your preference for variables is based on better
performances (at least until volumes start to get large).


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