>       Doesn't an xml tag also have to have either a value or 
> an attribute?

No. A commonly-used example would be the BR element in XHTML: <br />

>       Thus 
>               <contact>
>                       <foo />
>               </contact>
>       Isn't actually valid?

You wouldn't be able to tell the validity without having a DTD or schema. It
would, however, be well-formed.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized
instruction at our training centers in Washington DC, Atlanta,
Chicago, Baltimore, Northern Virginia, or on-site at your location.
Visit http://training.figleaf.com/ for more information!


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