tokenize(), grouping problem

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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