Re: Nested Muenchian Grouping

I am not sure if you are in a position to use XSLT 2.0. But if you
can, this problem is easier to solve using XSLT 2.0.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/test">
 <group>
   <xsl:for-each-group select="group/player" group-by="@state">
     <state name="{@state}">
        <xsl:for-each-group select="current-group()" group-by="@team">
          <team name="{@team}">
            <xsl:for-each-group select="current-group()" group-by="@position">
               <position name="{@position}">
                  <xsl:for-each select="current-group()">
                    <player name="{@name}" number="{.}"/>
                  </xsl:for-each>
               </position>
            </xsl:for-each-group>
          </team>
        </xsl:for-each-group>
     </state>
   </xsl:for-each-group>
 </group>
</xsl:template>

I need to turn this:

<test>
       <group>
               <player name="joe" position="pitcher" team="mets"
state="ny">2</player>
               <player name="mark" position="outfielder" team="mets"
state="ny">11</player>
               <player name="john" position="pitcher" team="mets"
state="ny">23</player>
               <player name="pete" position="outfielder" team="mets"
state="ny">27</player>
               <player name="roy" position="outfielder" team="mets"
state="ny">13</player>
               <player name="carl" position="infielder" team="mets"
state="ny">32</player>
       </group>
</test>

Into something like this:

<group>
       <state name="ny">
               <team name="mets">
                       <position name="pitcher">
                               <player name="joe" number="2"/>
                               <player name="john" number="23"/>
                       </position>
                       <position name="outfielder">
                               <player name="mark" number="11"/>
                               <player name="pete" number="27"/>
                               <player name="roy" number="13"/>
                       </position>
                       <position name="infielder">
                               <player name="carl" number="32"/>
                       </position>
               </team>
       </state>
</group>

Assuming there can be many states, many teams and many positions

I tried to nest the Muenchian method like this:

<xsl:key name="state-grouping" match="player" use="@state"/>
<xsl:key name="team-grouping" match="player" use="@team"/>
<xsl:key name="position-grouping" match="player" use="@position"/>

<xsl:template match="test/group">
       <group>
               <xsl:for-each select="player[count(. |
key('state-grouping', @player_ownership_details)[1]) = 1]">
                       <xsl:variable name="state" select="@state"/>
                       <xsl:variable name="state_node_set"
select="../player[@state=$state]"/>
                       <state name="{$state}">
                               <xsl:for-each
select="$state_node_set[(count(. | key('team-grouping', @team)[1]) =
1)]">
                                       <xsl:variable name="team"
select="@team"/>
                                       <xsl:variable
name="team_node_set" select="$state_node_set[@team = $team]"/>
                                       <team name="{$team}">
                                               <xsl:for-each
select="$team_node_set[(count(. | key('position-grouping',
@position)[1]) = 1)]">
                                                       <xsl:variable
name="position" select="@position"/>
                                                       <xsl:variable
name="position_node_set" select="$team_node_set[@position =
$position]"/>
                                                       <position
name="{$position}">

<xsl:for-each select="$position_node_set">

<player name="{@name}" number="{.}" />

</xsl:for-each>
                                                       </position>
                                               </xsl:for-each>
                                       </team>
                               </xsl:for-each>
                       </state>
               </xsl:for-each>
       </group>
</xsl:template>

But it doesn't produce the correct output when I add more data (more
teams, position, etc.)

Am I using the muenchian method correctly?  Is this something that can
be done?  I've been working on a solution all day (with more complicated
data) and I can't seem to get it to work.  Anyone out there ever pull
off something like this?

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