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Re: RE: xpath // query
Subject: Re: RE: xpath // query
From: "william locksman" <vsd18@xxxxxxxxxxxxxx>
Date: 24 Apr 2002 15:16:04 -0000
|
Dear Alex..
The discussion was for an xml structure like this...
<a>
<b>
<c> </c>
<c> </c>
<c> </c>
</b>
<b>
<c> </c>
<c> </c>
<c> </c>
</b>
</a>
Not the one u have given.. so in this case the discussion was ..
To reach C, which is better
a//b//c or a//c..
I think u got the problem wrong
On Wed, 24 Apr 2002 Aleksander Dye wrote :
I'm not quite sure I got you there....
Are you saying that select="A//B//C" and select="A//C" will
produce the same
result?
check this xml out:
<?xml version = '1.0' encoding = 'ISO-8859-1'?>
<a>
<c>a/c</c>
<b>
<c>a/b/c</c>
</b>
</a>
add the xsl:
<?xml version = '1.0' encoding = 'ISO-8859-1'?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:output method="html" encoding="ISO-8859-1" indent="yes"
/>
<xsl:template match="/">
1<p><xsl:value-of select="a//c" /></p>
2<p><xsl:value-of select="a//b//c" /></p>
</xsl:template>
</xsl:stylesheet>
And see the result:
1<p>a/c</p>
2<p>a/b/c</p>
Now how is that the same?
Regards,
Aleksander
-----Original Message-----
From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx
[mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx]On Behalf Of
Michael Kay
Sent: 24. april 2002 15:42
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: RE: xpath // query
> select="A//C"
> This would make the processor to search for C that are
> children of A iin the
> whole document.. This is definitely not fast
> select="A//B//C"
> would make the processor to search for all Cs under all Bs
under A.
> This is slightly better approach..
Fascinating. That's three respondents who were confident enough
to reply,
but guessed wrong!
It feels as if "A//B//C" gives the processor more information to
go on, and
therefore it should be able to reduce the search space. In fact,
for a
clever processor, the search space will be the same, and the only
difference
is that there is an extra (redundant) test to perform. But for a
processor
that adopts a simplistic execution strategy, that is (A//B)//C,
the search
space is definitely larger.
Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx
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william locksman - Wed, 24 Apr 2002 11:18:25 -0400 (EDT) <=
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