[xsl] Nested Muenchian Grouping

["Minervini, Chris" <christopher.minervini@xxxxxxxxxx>]

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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