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[XSL-LIST Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Multiple matches against keys?
 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? Thanks in advance for your time. Ramon 
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