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Old December 15th, 2003, 12:08 PM
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Default Explanation asked about XSL/XPath expression

I've used the following line in one of my xsl-documents (for an assignment for school), and it does exactly what it was ment to do... but....

My teacher asked if i could explain it for the class tomorrow, and i don't know how... :) Can someone help me with a description of what the following line exactly does? :)

<xsl:for-each select="//recepy[generate-id(.)=generate-id(key('book',author))]">
Thanks in advance!!!! ;)

Old December 15th, 2003, 01:39 PM
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I'm guessing here because you haven't shown us what your xml looks like, but presumably you have defined a key called 'book' which groups all nodes (recepy nodes?) by a common author child node.

So, the construct key('book',author) returns all (recepy?) nodes which have the same author as the current recepy node. Then generate-id does exactly what it says for the first node in that set.

generate-id(nodeX)= generate-id(nodeY) is a generic way of determining if the two nodes nodeX and nodeY are the same node. So you end up with a set containing one recepy node for each unique author node.

There's a very good explanation of this construct and its use in grouping here:

hth - post your XML and XSLT if you it still doesn't make sense.
Old December 15th, 2003, 06:29 PM
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Hi Phil!

Thank you very much! I already knew what the code's function was, and a bit about what it 'really' did. But your explanation is very useful for my class tomorrow thank you very much!

And i'll remember to put more relevant code in my post next time, your assumptions were right, luckily for me ;)

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