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Re: counting elements with values that match other el
Subject: Re: counting elements with values that match other element values|
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Thu, 18 May 2006 09:32:12 -0400
It is tempting to try running your code and knowing for sure, but
even without doing that, insofar as I understand your requirements
you are almost there. (I can't say for sure because I'm not sure I
understand your requirements fully. For example, what should happen
if you have c elements with the same value inside the same cSet?)
But a performant version of this would probably use keys to speed up
the lookup. Doing it using brute-force XPath, like this, is going to
bog down on sizable documents.
Since it doesn't sound like this is super-critical, maybe I'll leave
it at that -- if you can get the key() arrow into your XSLT quiver,
you'll be doing great.
At 07:28 AM 5/18/2006, you wrote:
I step away from xpath and xslt for long stretches, and when I
come back, parts of the big picture are a little fuzzy. My sense
is that for the problem below, I need to loop; the test can't be
done in a single XSLT1.0 statement.
I have a set of elements ("t") with children under them
("t/cSet/c"). I'm looking for children that occur twice. I'd like
get a nice 1.0 nodeset, which is the practical reason for trying to
shoehorn the task into a single statement.
The xslt and xml are below. I used command-line saxon for debugging.
The expression for the element "Find_Cs_In_Ts" is what I'd like
to either get working, or get an official confirmation that the
task is impossible. In the real implementation the "> 0" would
be " = 2", and the answer would be "3, 5, and 7", which are the
numbers that occurs twice in the set. The other elements are just
me playing around with similar constructions that return related data.
In SQL, this would be something like
select * from ccc where (select count
(*) from T/cSet as TC where tc.c = ccc.c ) >0
Any explanation for what the right syntax is, or, conceptually,
why the idea doesn't fit in with xslt1.0 would be greatly
appreciated. I've got looping code for the task almost
implemented, so, mostly I'm asking for how the parser is reading
the expression I wrote, and how far away is what I wrote from what
I really wanted?
Another approach might be to use the parent axis to walk back up
and then over to other T elements to find the related data.
thanks for any suggestions,
<?xml version="1.0" encoding="UTF-8"?>
<xsl:template name = "make-Choices">
<xsl:variable name = "output" >
<xsl:element name = "ccc"><xsl:copy-of select="root/ccc/*"/>
<xsl:element name = "Find_Cs_In_Ts"><xsl:copy-of select="
//root/ccc/c[ count( //root/t[ h =1 and . = cSet/c ]
) > 0 ] "/> </xsl:element>
<xsl:element name = "Count7s_In_TH"><xsl:copy-of select="
count( //root/t[ h =1 and cSet/c = 7 ] ) "/>
<xsl:element name = "Cs_In_Ts"><xsl:copy-of select="
//root/ccc/c[ . = //root/t[ h =1 ]/cSet/c ] "/>
<xsl:element name = "Count_TCs_In_C"><xsl:copy-of
select="count( root/t[h =1]/cSet/c[. = //root/ccc/c] ) "/> </xsl:element>
<?xml-stylesheet type="text/xsl" href="ukbSmall.xslt"?>
Wendell Piez mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc. http://www.mulberrytech.com
17 West Jefferson Street Direct Phone: 301/315-9635
Suite 207 Phone: 301/315-9631
Rockville, MD 20850 Fax: 301/315-8285
Mulberry Technologies: A Consultancy Specializing in SGML and XML
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