<xsl:choose>'ing from different forms of a tag

Hi,

I have an XSD file that uses a xsd:union to allow the tag <term> to have
one of three different sequences.  In particular, <term> can be of any
of the following:

(1)     <term>
                <term>...</term>
                <_literal_>*</_literal_>
                <factor>...</factor>
        </term>


(2)     <term>
                <term>...</term>
                <_literal_>/</_literal>
                <factor>...</factor>
        </term>


(3)     <term>
                <factor>...</factor>
        </term>



My question is: when I write a templat for <term>, can I match against
the different sequences?  For example, I would like to write a
transform like:

        <xsl:template match="term">
        <xsl:choose>

                <xsl:when test="[ somehow test for form (1) ]">
                        (do stuff)
                </xsl:when>


                <xsl:when test="[ somehow test for form (2) ]">
                        (do different stuff)
                </xsl:when>


                <xsl:when test="[ somehow test for form (3) ]">
                        (do completely different stuff)
                </xsl:when>


                <xsl:otherwise>
                        (never get here, no other forms are allowed)
                </xsl:otherwise>

        </xsl:choose>
        </xsl:template>

I don't know what to put in the test="..." areas though.  Any ideas?

Thanks,

        Jared



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