>Has anyone used Microsoft Index Server or any other Search engine on
>XML files.

I used the Verity search engine.  It doesn't offer explicit support for XML
-- but it doesn't need to!  It has a simple (but quite useful) notion of
hierarchical tags, so it can search badly-hacked HTML as well as "XML".  (I
added the quotes since I'm not sure if it supports UTF-8 and such.)

Samples:
	wendy <in> from
	wendy <in> message
	wendy <in> from <in> message

(assuming an XML version of your e-mail)

Note that it can skip levels, i.e. <in> doesn't imply a strict parent/child
but only an ancestor of some sort.

cheers,

-- SSL, PreFab Software <http://www.prefab.com/>



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