How Do I Select A Section of XML Based On A Code Value

Hi,
I have an xml something like this:

	<VehInfo>
		<ModelYear>2004</ModelYear>
		<Model>Ford</Model>
		<UsageInfo>
			<UsageInfoCode>Work</UsageInfoCode>
		</UsageInfo>
	</VehInfo>
	<VehInfo>
		<ModelYear>1994</ModelYear>
		<Model>Toyota</Model>
		<UsageInfo>
			<UsageInfoCode>Pleasure</UsageInfoCode>
		</UsageInfo>
	</VehInfo>

and want to transform this into xml using xsl, selecting the correct section based on the <UsageInfoCode> tag. For example, if I am to select using an "UsageInfoCode" of "Work", then I want the output xml to look like this:

	<VehInfo>
		<ModelYear>2004</ModelYear>
		<Model>Ford</Model>
	</VehInfo>

Any help would be greatly appreciated!
thanks....gary...

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