[xsl] XPath expression to derive list of distinct element names

[Sean McMurray <sean at viaverio dot com>]

I need an XPath expression that will return a list of node names it the 
tree frag.
I want the names to be distinct.

The best I can come up with is:
    "*[local-name() != local-name(preceding-sibling::*)]"

But the local-name function only gives the name of the first node in the 
nodeset.

This is really an XPath question. I'm not doing this in XSL, so I can't 
use templates or any other non-XPath construct.
It needs to be a single XPath expression.

Thanks for any help.


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