XML certification?

[Niels Peter Strandberg <nielspeter@npstrandberg.com>]

You can become a certified java programmer, developer architect, this 
tell the world, that you know the language, you can make applications, 
and do J2EE stuff + more.

But what about XML? If you want to be certified in XML, then what does 
that mean?

Is it about: wellformnes, entities, XSLT, DTD, XML Schema etc, or is it 
about: SAX, DOM etc, or is it about: Java, C#. Or all of them?

What should the "test" consists of? What do you need to know to get a 
"XML Certificate"

What are your experiences on "XML Certification"?


Niels Peter