Yves Forkl wrote:
1) There are element children, and they all have the attribute.
2) Each of the element children, if any, does not have the attribute.
3) Some element children do have the attribute, some don't.
The solution I have found (thanks again to you and David) is to
explicitly couple the existence of children with attribute presence
for case 1, then proceed to case 2 where I just test for attribute
absence before passing on to the "otherwise" clause representing case 3:
<xsl:choose>
<xsl:when
test="* and (every $child in * satisfies $child[(_at_)my_attribute])">
</xsl:when>
<xsl:when
test="every $child in * satisfies $child[not(@my_attribute)]">
</xsl:when>
<xsl:otherwise>
</xsl:otherwise>
<xsl:choose>
Relying on the evaluation order of the instructions within xsl:choose
spares me from having to use more complicated (or less familiar :-))
test expressions.
Note that for case 2, testing revealed that I can't test for
not(every $child in * satisfies $child[(_at_)my_attribute])
Your second test can be simplified if you make the third test to be your
second:
<xsl:when test="*[(_at_)my_attribute]">
which will leave your <xsl:otherwise /> to catch what's now in "every
$child in ... not(@my..." (you can remove that altogether). Of course,
it is a matter of taste. I dislike the 'every' and 'some' expressions,
because they tend to be very confusing, even on second read, and
especially when used with negation:
<xsl:choose>
<xsl:when
test="* and (every $child in * satisfies $child[(_at_)my_attribute])">
<!-- all children have @my_attribute -->
</xsl:when>
<xsl:when test="*[(_at_)my_attribute]">
<!-- some children have @my_attribute -->
</xsl:when>
<xsl:otherwise>
<!-- zero children, or none have @my_attribute -->
</xsl:otherwise>
<xsl:choose>
Cheers,
-- Abel Braaksma
http://www.nuntia.nl
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