conditional copying of nodes?

How can I do conditional copying of nodes? For example, I have the following
XML snippet, with an individual being in one or many groups. I am doing a
Muenchian method sort, which works. (Thanks Jeni!) The problem is that I am
unable to put someone more than one group unless I physically duplicate
their record. In the example below, I would copy my name, e-mail and phone
twice; once using the <group> of "Core Group" and once using "Steering
Committee".


XML:
<teammembers>
	<member contact="yes">
	    <group>Core Team</group>
	    <group>Steering Committee</group>
		<name>
			<given_name>Doug</given_name>
			<last_name>Hewko</last_name>
		</name>
		<e_mail>doug.hewko</e_mail>
		<phone>
			<number>555-1234</number>
		</phone>		
	</member>
	<member contact="yes">
	    <group>Core Team</group>
		<name>
			<given_name>John</given_name>
			<last_name>Doe</last_name>
		</name>
		<e_mail></e_mail>
		<phone>
			<number>342-1234</number>
		</phone>		
	</member>

</teammembers>

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