SV: [xsl] questions about preceding::processing-instruction

["Erik Zander erik.zander@xxxxxxxxxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Thanks Gerrit,

You pointed me in the right direction so I could avoid the timeout :)

The solution was close at hand
<xsl:variable name="currentPage"
select="substring-before(substring-after(./preceding::processing-instruction(
'anchor')[1], 'Page.'), '&quot;')"/>

Just using the fact that preceding is in reverse order :)

Regards
Erik

-----Ursprungligt meddelande-----
FrC%n: Imsieke, Gerrit, le-tex gerrit.imsieke@xxxxxxxxx
[mailto:xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx]
Skickat: den 10 april 2017 15:31
Till: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Cmne: Re: [xsl] questions about preceding::processing-instruction



On 10.04.2017 15:12, Erik Zander erik.zander@xxxxxxxxxxxxxxxxxxxx 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-afte
> r(((./preceding::processing-instruction('anchor'))[last()]),
> 'Page.'), '&quot;')"/>
>
> Which works (although I donbt 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[. &lt;&lt; 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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