RE: [xsl] For-each loop or recursion

["Aron Bock" <aronbock@xxxxxxxxxxx>]

Oleg, first off, kudos on the thought you're bringing to bear on what you 
say is a new subject.


> I have the following data (leaves in parallel branches):
> mystruct/myarray1[i]/myvar/var2 and
> mystruct/myarray2[i]/myvar/var3
>
> I need to implement the find the first occurence of :
> <xsl:if test="position() != last() and
>   number(var2) = number(var2[position()+1]) and
>   number(var3) = number(var3[position()+1])">
>       <value-of select="position()">
> </xsl:if>

You're approaching this procedurally, it seems, whereas you'd be better 
served using XSL's natural declarative model.  Like with SQL, for example.  
Thus, rather than trying to pick through and find a specific node or value 
in imperative fashion, try to "describe" to the processor what you're 
looking for.

For example, with this XML input:

<mystruct>
   <myarray>
       <myvar>22</myvar>
       <myvar>2</myvar>
       <myvar>3</myvar>
       <myvar>5</myvar>
       <myvar>77</myvar>
       <myvar>78</myvar>
       <myvar>1</myvar>
   </myarray>
</mystruct>

This XSL will find the fist <myvar> node whose value is 1 less than it's 
immediately succeeding <myvar> sibling:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>

   <xsl:output indent="yes" method="xml" omit-xml-declaration="yes"/>

   <xsl:template match="/">
       <node>
	    <xsl:copy-of select="mystruct/myarray/myvar[. =  
following-sibling::myvar[1] - 1][1]"/>
       </node>
   </xsl:template>
</xsl:stylesheet>

Yields:

<node>
 <myvar>2</myvar>
</node>

You should be able to do something similar for your problem.

Regards,

--A



> A few questions to XSLT gurus:
> 1)  Does it make sense to do in the for-each loop or it will require a
> recursion ?
> All I need is to get the position of the 1st occurrence.
> How would that recursion look like?
>
> 2) Will I be able to get a node from the parallel branch in for-each loop ?
> Something like:
> <xsl:for-each mystruct/myarray1[i]/myvar>
>   <xsl:if test=" ...and number(../../myarray2[i]/myvar/var3) =
> number((../../myarray2[i]/myvar/var3)[position()+1]) and...">
>     <value-of select="position()">
>   </xsl:if>
> </xsl:for-each>)
> I know it looks awful  :-(
>
> 3) Is there a way to somehow start the for-each loop
> from position other than 1 ?
> Like with j>1:
> <xsl:for-each mystruct/myarray1[i]/myvar[j]>
> ....
> </xsl:for-each>
>
> I am using XSLT 1.x

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