indexing and querying XML (not XQuery)

Hi,

Someone on the Lucene user's list posted a link to this paper:

http://www.idealliance.org/papers/xmle02/dx_xmle02/papers/03-02-08/03-02-08.html

that talks about indexing and searching XML documents. I have been doing 
something similar for a while (3 years, I think) but it is specific to 
our configuration/content which probably doesn't have wider 
applicability. I have also found it to be:

"a fast, reliable XML search engine, which has exceeded our expectations 
in terms of flexibility and low development cost."

I was thinking the article would be of interest to many people here. I 
was also wondering about your thoughts on this method of dealing with 
XML. I have not looked in depth at XQuery, and I am wondering what 
strengths/benefits XQuery would have over using something like Lucene to 
index/query XML.

It would be interesting to see what folk from this list would come up 
with if they put their brains to work on ways to handle 
indexing/searching with something like Lucene.

best,
-Rob