RE: [xsl] Number of elements with a given attribute

[J L <jinlii@xxxxxxxxxxx>]

I'm new to XSLT 2.0. I tried this example in Altova and couldn't get the
output below. I'm not sure if the input is wrong or my xsl is incorrect.
Thanks for your time!
 
> <verse>
>   <part role=3D"a">...</part>
>   <part role=3D"a">...</part>
>   <part role=3D"b">...</part>
> </verse>
> <verse>

input xml:
<verses>
    <role name="a">
        <verse>...</verse>
        <verse part="beginning">1</verse>
    </role>
    <role name="a">
        <verse part="continuation">continuation 2</verse>
    </role>
    <role name="b">
        <verse part="continuation">continuation 3</verse>
    </role>
    <role name="b">
        <verse part="end">end</verse>
        <verse>...</verse>
    </role>
    <role name="a">
        <verse>...</verse>
        <verse part="beginning">1</verse>
    </role>
    <role name="a">
        <verse part="continuation">continuation 2</verse>
    </role>
    <role name="b">
        <verse part="continuation">continuation 3</verse>
    </role>
    <role name="b">
        <verse part="end">end</verse>
        <verse>...</verse>
    </role>
</verses>

xsl:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
xmlns:fo="http://www.w3.org/1999/XSL/Format";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
xmlns:fn="http://www.w3.org/2005/xpath-functions";>
    <xsl:template match="verses">
        <xsl:for-each-group select="*"
group-starting-with="role/verse[empty(@part)] | verse[@part='beginning']">
            <xsl:variable name="verse-number" select="position()"/>
            <verse>
                <xsl:for-each select="current-group()">
                    <part role="parent::role/@name">
                        <xsl:copy-of select="node()"/>
                    </part>
                </xsl:for-each>
            </verse>
        </xsl:for-each-group>
    </xsl:template>
</xsl:stylesheet>

> From: mike@xxxxxxxxxxxx
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Date: Fri, 18 Dec 2009 09:45:18 +0000
> Subject: RE: [xsl] Number of elements with a given attribute
>
>>
>> In a piece of theater, I have some verses that are split
>> between different roles.
>>
>> The other are tagged on the following model:
>> <role name='...'>
>>    ...
>>   <verse>...</verse>
>>   <verse part="beginning">...</verse>
>> </role>
>> <role name='...'>
>>   <verse part="continuation">...</verse> </role> <role name='...'>
>>   <verse part="continuation">...</verse> </role> <role name='...'>
>>   <verse part="end">...</verse>
>>   <verse>...</verse>
>>   ...
>> </role>
>>
>
>> I wish to have the count of preceding parts of verse from the
>> last beginning part.
>> Regards,
>
> A classic case of two overlapping hierarchies running over the same data.
> One of these hierarchies is represented directly in the XML tree structure,
> the other is represented indirectly. You want to perform an operation on
the
> "hidden" hierarchy, so it's best to invert the structure so the verse
> hierarchy becomes the primary one. That is, you want:
>
> <verse>
>   <part role="a">...</part>
>   <part role="a">...</part>
>   <part role="b">...</part>
> </verse>
> <verse>
>    ...
>
> which can be done like this:
>
> <xsl:for-each-group select="$verses"
> group-starting-with="verse[empty(@part)] | verse[@part='beginning']">
>   <xsl:variable name="verse-number" select="position()"/>
>   <verse>
>     <xsl:for-each select="current-group()">
>       <part role="parent::role/@name">
>         <xsl:copy-of select="node()"/>
>       </part>
>     </xsl:for-each>
>   </verse>
> </xsl:for-each-group>
>
> You now have each verse represented by a complete element, broken into
parts
> to show who speaks each part of the verse, and this makes it easy for
> example to number the parts of a verse as you have asked for.
>
> Regards,
>
> Michael Kay
> http://www.saxonica.com/
> http://twitter.com/michaelhkay
>

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