Oracle secret weapon is VP Jim Melton who is ANSI SQL editor who edited the XML section in ANSI SQL 2006. That got me very worried because for political reasons Microsoft could just wait until the XML people finish the needed Algebra before implementing real XQuery which could be too late for SQL Server 2008. So for XML data intensive Web application you may still need to reach out and touch Data Direct who owns the XQuery url and sells an almost idiot proof albeit expensive tool.

Oracle does not sell developer edition of its RDBMS so for now it is like C.J.Date said do data as algebra and ask how is this implemented by Oracle.