W3C Schema: Resistance is Futile, says Don Box

"The reality is, XML Schema is the foundation for the rest of XML," said Box. Technologies such as XML Query take XML 
Schema "for granted, as a given," he said.

SOAP messages need to function with XML Schema, he said. "XML Schema is an inevitability. Resistance is futile. There 
is no point in not embracing this thing and I strongly encourage those of you who work in Web services technologies 
[to] make sure your story is straight" with respect to XML Schema, Box said.

http://www.infoworld.com/articles/hn/xml/02/06/06/020606hnbox.xml?s=rss&t=news&slot=3