> Not sure there is much more metadata in an XML database than in a data
> database.

In a standard database, the data and metadata are stored separately, not so with XML.  
When the next new "latest and greatest" thing
comes along, you'll have to strip all that metadata out of your data.  It also makes 
for bigger databases, and a lot more wasted
space, like comparing normalized and unnormailzed tables.

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