[xsl] Unique sorting

["David Dymm" <dymm@xxxxxxxxx>]

Assume the following XML hierarchy:

   A -|- B -|- C -|- D -|- E

repeated **many** times within the document.  I want to produce an unique
sort based on the value of C so that each value of C is only repeated once
in my output.  How is this done?

    David Dymm
    SAIC
    304 284-9000 x228
    304 284-9001 [fax]
    Dymm@xxxxxxxxx


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