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[xsl] tokenize(), grouping problem

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Once again, I know I'm missing something obvious. Could somebody wiser put me out of my misery?

If I have xml:

<data>
	<record>
		<subjects>subj1; subj2; subj3</subjects>
	</record>
	<record>
		<subjects>subj4; subj1; subj5</subjects>
	</record>
	<record>
		<subjects>subj3; subj6; subj5</subjects>
	</record>
</data>

and wish to obtain result:

<data>
	<subject>subj1</subject>
	<subject>subj2</subject>
	<subject>subj3</subject>
	<subject>subj4</subject>
	<subject>subj5</subject>
	<subject>subj6</subject>
</data>

I can use tokenize() to split the strings at the semicolon, but how can I then use the result in a for-each-group group-by procedure to output the unique values?

__________
J.J. Crump
Dept. of History 353560
University of Washington
Seattle, WA. 98195

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