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RE: [xsl] Restrictions on XPath expressions in

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> >Does someone know a reason why this won't compile:
> >
> ><xsl:key name="templates"
> >match="/onm:NetworkModel/onm:Graph/(onm:Nodes|onm:Links)/(onm
> :Link|onm:
> >N ode)/onm:Templates/onm:Template" use="@Name" />
> 
> Because match= attributes are restricted to be XPath 
> patterns, not all XPath expressions.
> 
> >...but this will:
> >
> ><xsl:template match="onm:Graph">
> >     <xsl:copy>
> >         <xsl:if
>
>test="(onm:Nodes/onm:Node|onm:Links/onm:Link)/onm:Attributes/onm:Attribute"
>
> 
> Because test= is not restricted to only being a pattern.
> 

And even if it weren't a distinction between patterns and expressions, in an
XPath 1.0 expression (which I suspect you are using) a union expression can
be used on the lhs of "/" but not on the rhs of "/".

Michael Kay
http://www.saxonica.com/

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