A future version of DB2 UDB will support a tighter integration of
XQuery with SQL -- being able to embed XQuery in SQL statements, and
vice-versa.

Dr. Daniela Florescu of the W3C XML Query Working Group suggests an
approach the industry should be taking with XML and XQuery processing:

http://www.webservicessummit.com/Peo...DeclarativeXML

Dana departs from the philosophy that XML is a technology for
documentation and data interchange. She suggests we haven't exploited
XML to its fullest potential and proposes a declarative approach to XML
and XSLT processing.