Re: Re: Re: limiting preceding axis by ancestor

Joerg Heinicke <joerg dot heinicke at gmx dot de> wrote:

The [1] is implicit and not needed, because generate-id() on a nodeset returns the id of the first element in this nodeset. I wrote it for maybe better understanding.

<xsl:if test=". = preceding::bar[generate-id(ancestor::foo[1]) = generate-id(current()/ancestor::foo[1])]">

This is one case where the established belief that

generate-id(someXPathExpression) = generate-id(someXPathExpression[1])

is *not* true.

This is clearly not so, because "ancestor" is a reverse axis.

generate-id(ancestor::foo[1])

will be applied on the nearest ancesstor (the last in document order)

while

generate-id(ancestor::foo)

will be applied on the outermost ancestor (the first in document
order).