On 2 May 2020, at 11:52, Michael Müller-Hillebrand mmh(_at_)docufy(_dot_)de
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:
Hi folks,
if a sequence stored in a variable consists of elements, we can not use the
nice function index-of().
You can, but it might not do what you want...
Saxon (PE+, 10.0+) has an extension function
saxon:index-where($seq, $predicate)
so you can do, for example, saxon:index-where($nodes, function($n){$n is
$required-node})
Also, if the variable is typed as="element()*" I cannot use the axes
preceding-sibling or following-sibling.
Again, you can, but it might not do what you want. Presumably you want to find
adjacent members of the sequence. Of course a node might appear three times in
the same sequence, so just knowing the node and the sequence isn't enough...
I can solve that by not typing the variable or use as="document-node()"
after adding <xsl:document> to the variable's sequence constructor.
That will copy all the nodes and change their siblings and ancestry..
My current solution finding the position of the first <h1> in a sequence
would be something like:
You're talking about a solution, but I don't think you've told us what the
problem is. What are you trying to achieve?
count($seq/h1[1]/preceding-sibling::*) + 1
with $seq being a sequence typed as document-node().
Are there better methods to get the position of a certain element in the
sequence?
for $i in (1 to count($nodes)) return if ($nodes[$i] is $required-node) then $i
else ()
or more concisely
(1 to count($nodes))[subsequence($nodes, . 1) is $required-node]
You could also implement the saxon:index-where() function as
(1 to count($seq))[$predicate(subsequence($nodes, ., 1))]
(subsequence($nodes, $x, 1) is used rather than $nodes[$x] because predicates
change the context item)
Michael Kay
Saxonica
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