testing for several different conditions

In my XSL:

        <xsl:when test= ".[//bookmark/@name = @internal]">
           ...
        </xsl:when>

This checks to see if I have a bookmark anywhere in the page with a name
that corresponds to @internal before it creates a link a hyperlink.
However, I also want to continue if (@internal = 'whatnext'  and there is a
//next element) or (@internal = 'related' and there is a //related element).
I can't figure out the syntax for doing this.  Thanks.  Eric




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