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Michael, Dimitri.
you are right it shouldn't be a dark corner, but it IS in practice. This
does do people's heads in... and it's a source of bugs. I've been called
on site by clients just to find and fix this particular problem quite a
few times.
The usual story goes as follows: "ah well we used to use select="" but
then we had to add some choose and if and had to use a child element". Boom.
Christian
Michael Kay wrote:
> This shouldn't be a dark corner, because the fact that nodes have identity
> is pretty fundamental, but sadly there are lots of people who aren't aware
> of the implications. The answer of course is (2).
>
> Michael Kay
> http://www.saxonica.com/
>
>
>>-----Original Message-----
>>From: Oleg A. Paraschenko [mailto:olpa@xmlhack.ru]
>>Sent: 01 September 2005 20:45
>>To: xml-dev
>>Subject: [xml-dev] quiz on select vs copy-of
>>
>> Hello,
>>
>> do you know the dark corners of XSLT? Here is one. Compare two
>>variables:
>>
>><xsl:variable name="v1" select="some-xpath"/>
>><xsl:variable name="v2"><xsl:copy-of
>>select="some-xpath"/></xsl:variable>
>>
>> Are "v1" and "v2" the same? I mean: can "v1" and "v2" be used in a
>>program interchangeably? Answers:
>>
>>1) yes
>>2) no
>>3) implementation-dependant
>>
>>.
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>> The right answer is (2): no. Changing a use of "v1" to
>>"v2", or reverse,
>>might change the result of a stylesheet. I'll post an example
>>later. Or
>>you can provide your version.
>>
>>
>>--
>>Oleg Paraschenko olpa@ http://xmlhack.ru/ XML news in Russian
>>http://uucode.com/blog/ Generative Programming, XML, TeX, Scheme
>>
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>
>
>
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