On 10.04.2017 15:12, Erik Zander
erik(_dot_)zander(_at_)studentlitteratur(_dot_)se wrote:
Hi All!
I have an optimization problem concerning
preceding::processing-instruction.
First some background in my xml I have processing instructions like
<?anchor xml:id="orgPage.7"/?> representing the start of a page.
And I have a template that matches on *text().*
In the template matching on text() I want to know the page number.
To get this I have in the text template declared a variable as
<xsl:variablename="currentPage"select="substring-before(substring-after(((./preceding::processing-instruction('anchor'))[last()]),
'Page.'), '"')"/>
Which works (although I don’t see why as I had the understanding that
preceding:: returned in reverse document order) but it takes up a great
deal of the processing time.
So my questions are:
Is there a better (faster/smarter) way to get the page from the
processing instruction.
Maybe put all of them into a global variable and then do something like
($all-page-anchors[. << current()])[last()]
And is it the expected behavior that calling
preceding:processing-instruction() gives me
<?anchor xml:id="orgPage.1"/?>
<?anchor xml:id="orgPage.2"/?>
<?anchor xml:id="orgPage.3"/?>
<?anchor xml:id="orgPage.4"/?>
I have this behavior in both Saxon 9.6.0.7 and Marklogic.
This is because the ( ) around the expression effects that the nodes
will be put in document order. See the note after
https://www.w3.org/TR/xpath20/#dt-numeric-predicate
Gerrit
Regards
Erik Zander
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