Re: [xsl] Multiple matches against keys?

["Ramon M. Felciano @ Yahoo" <felciano@xxxxxxxxx>]

Wow -- that's appealingly simple. What I actually want is the following:

- CONTEXT: call: (3 tasks)
   - Task: Make a phone call
   - Task: This is to be done at home, and is a phone call
   - Task: This is a call to be made from work
- CONTEXT: home: (2 tasks)
   - Task: This is to be done at home
   - Task: This is to be done at home, and is a phone call
- CONTEXT: work: (1 tasks)
   - Task: This is a call to be made from work

I think that's what you had in mind, but the last context label should be "work", not "work call". I'm using libxslt tho so I don't think the XSLT 2.0 solution will work for me yet.

Ramon

Andrew Welch wrote:

> > I'm trying to group and sort a list of tasks by category, where one 
> > <task> may have multiple categories identified by <context> 
> > tags. I find 
> > that I get different results depending on the ordering in the 
> > source XML:
> >
> > <tasks>
> >    <task>
> >        <subject>This is to be done at home</subject>
> >        <context>home</context>
> >    </task>
> >    <task>
> >        <subject>No context so skip this one.</subject>
> >    </task>
> >    <task>
> >        <subject>Make a phone call</subject>
> >        <context>call</context>
> >    </task>
> >    <task>
> >        <subject>This is to be done at home, and is a phone 
> > call</subject>
> >        <context>home</context>
> >        <context>call</context>
> >    </task>
> >    <task>
> >        <subject>This is a call to be made from work</subject>
> >        <context>work</context>
> >        <context>call</context>
> >    </task>
> > </tasks>
> >
> > Using the following XSLT, I get what I want:
> >
> > <xsl:stylesheet version="1.0" 
> > xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
> >    <xsl:output method="xml" version="1.0" encoding="UTF-8" 
> > indent="yes"/>
> >    <xsl:key name="tasks-by-context" match="task" use="context"/>
> >    <xsl:template match="/">
> >        <ul>
> >            <xsl:for-each select="//task[count(. | 
> > key('tasks-by-context', context)[1]) = 1][count(context)>0]">
> >                <xsl:sort select="subject"/>
> >                <xsl:variable name="c" select="context"/>
> >                <li>
> >                    CONTEXT: <xsl:value-of select="$c"/>: 
> > (<xsl:value-of 
> > select="count(key('tasks-by-context',$c))"/> tasks)
> >                    </li>
> >                <ul>
> >                    <xsl:for-each 
> > select="key('tasks-by-context', $c)">
> >                            <li>
> >                                    Task : <xsl:value-of 
> > select="subject"/>
> >                            </li>
> >                    </xsl:for-each>
> >                </ul>
> >            </xsl:for-each>
> >        </ul>
> >    </xsl:template>
> > </xsl:stylesheet>
> >
> > As I'm skipping uncategorized tasks (i.e. with no <context> 
> > children), I 
> > get the following output:
> >
> > - CONTEXT: call: (3 tasks)
> >    - Task : Make a phone call
> >    - Task : This is to be done at home, and is a phone call
> >    - Task : This is a call to be made from work
> > - CONTEXT: home: (2 tasks)
> >    - Task : This is to be done at home
> >    - Task : This is to be done at home, and is a phone call
> >
> > However, this behavior differs if the original <task> 
> > elements are in a 
> > different order. For example, moving the "Make a phone call" 
> > task to the 
> > end of the <tasks> list reduces the output to the following:
> >
> > - CONTEXT: home: (2 tasks)
> >    - Task : This is to be done at home
> >    - Task : This is to be done at home, and is a phone call
> >
> > So it looks like my key definition is no longer picking up 
> > "call" as a 
> > valid key item. I'm actually not sure whether I'm using the <xsl:key> 
> > tag correctly here -- will it match and index a single <task> node 
> > multiple times if it contains multiple tags?
> >    
>
>
>
> Here's an XSLT 2.0 solution, although I'm not sure your desired output
> is correct:
>
> <xsl:template match="/">
>    <xsl:for-each-group select="/tasks/task" group-by="context">
>        <xsl:text>- CONTEXT: </xsl:text>
>        <xsl:value-of select="context"/>: (<xsl:text/>
>        <xsl:value-of select="count(current-group())"/>
> tasks)&#xa;<xsl:text/>
>        <xsl:for-each select="current-group()/subject">
>            <xsl:text>    - Task: </xsl:text>
>            <xsl:value-of select="."/><xsl:text>&#xa;</xsl:text>
>        </xsl:for-each>
>    </xsl:for-each-group>
> </xsl:template>
>
> This will produce:
>
> - CONTEXT: call: (3 tasks)
>    - Task: Make a phone call
>    - Task: This is to be done at home, and is a phone call
>    - Task: This is a call to be made from work
> - CONTEXT: home: (2 tasks)
>    - Task: This is to be done at home
>    - Task: This is to be done at home, and is a phone call
> - CONTEXT: work call: (1 tasks)
>    - Task: This is a call to be made from work
>
> Whereas your desired output is:
>
> - CONTEXT: call: (3 tasks)
>    - Task : Make a phone call
>    - Task : This is to be done at home, and is a phone call
>    - Task : This is a call to be made from work
> - CONTEXT: home: (2 tasks)
>    - Task : This is to be done at home
>    - Task : This is to be done at home, and is a phone call
>
> Wouldn't you want to output the 'work' context as well?
>
> cheers
> andrew