I wrote a lot about XML and RDF for various publications back when there were publications that would pay for it. Now I mostly just write for my blog.

Some things I wrote:

Good Introductions to XML

The SGML/XML Web Page is the ultimate reference on all that's available in the world of XML and SGML. (Note that it's searchable.)

"The elements be kind to thee, and make thy spirits all of comfort!"
Anthony and Cleopatra, III ii