Re: [xsl] matching-pattern of xsl:key

[Trevor Nash <tcn at melvaig dot co dot uk>]

>Hello,
>
>I have a little problem with the xsl:key. I would select only nodes with
>specific root-nodes.  Like this:
>
><xsl:key name="distinct-join" match="/FROM/JOIN//*" use="@table" />
>
>This should index only all Nodes under /FROM/JOIN. But this wont work. 
>
>Or can only use one Node- or Attribute-Name?
>
No, its a pattern - what you have written is legal.  So I guess it
doesn't mean what you think it means.

This pattern will only match nodes if your document has a top level
element <FROM> with one or more children of type <JOIN>.  If <FROM> is
not the top level element, then you meant match="//FROM/JOIN//*".

If you have problems with the transform running slowly, you may want
to turn the pattern the other way up:
match="*[ancestor::JOIN[parent::FROM]]"
Whether you need to do this depends on how smart your processor is.
Regards,
Trevor Nash
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