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Re: [xsl] Nested grouping question

Subject: Re: [xsl] Nested grouping question
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxxx>
Date: Fri, 02 Jan 2004 17:51:49 -0500

Hi Andrew,

At 04:29 PM 1/2/2004, you wrote:
I've got an XML file organized in one way that I'm trying to convert to
match the organization of other files that I deal with.  I want the file
hierarchy to be:


There are many games, states, and users.


The file that I'm trying to convert is organized by user.  I can do grouping
to determine the states and games, but it seems like I need to do redundant
grouping to do the conversion.

I'm unsure of what you mean by needing "redundant grouping".

But I can give a couple of hints on how to proceed. If you're using keys to retrieve your nodes when grouped, as you probably know

<xsl:key name="users-by-state" match="user" use="state"/>

will let you retrieve all the <user> elements with a given state as the value of a <state> element child.

Similarly, providing each <user> has just one state and one game, you can create a compound key

<xsl:key name="users-by-state-game" match="user" use="concat(state, game)"/>

which will get you all the users that contain a given state/game combination.

To handle what might be the "redundant grouping" problem you allude to, you might also find a key useful to retrieve all the states represented for a given game:

<xsl:key name="state-by-game" match="state" use="../game"/>

This will give you a way to traverse over the states for each game (the first level of your grouping); within this traversal (of course, you'll have to de-duplicate these sets of nodes as you go, in the usual way), you can use the compound key to get the particular users for each state/game.

I hope that's a help. Ask again if I'm being too sketchy. Definitely consult http://www.jenitennison.com under "grouping" if you haven't already; a search for "XSLT two-level grouping" might also turn something up.


Wendell Piez                            mailto:wapiez@xxxxxxxxxxxxxxxx
Mulberry Technologies, Inc.                http://www.mulberrytech.com
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