Re: [xsl] optional children

[Jeni Tennison <jeni@xxxxxxxxxxxxxxxx>]

Hi Andrew,

> <xsl:if test="b and not(*[not(self::c or self::d)])">
>   <foo />
> </xsl:if>
>
> Ok so here you are using not() within a not() to exclude nodes from
> the list of excluded nodes... this doesnt work for me but I get the
> logic behind it. Does it fail because not(*[...]) will evaluate to
> false before it even gets to the predicates (because <b> must exist
> already)?? Or will the first predicate always be evaluated if there
> is one?

Sorry, I think it's because I missed self::b from the list:

  b and not(*[not(self::b or self::c or self::d)])

should work better.

Oleg's solution is neater anyway though, as long as it's unlikely that
there'll be hordes of children of a (because if there were lots of
children then doing count()s would involve a lot of node visits which
would take time).

Cheers,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/


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