XMLDB
From Oracle FAQ
Oracle XMLDB is a standard option that ships with the Oracle database. XMLDB turns Oracle into a high-performance, native XML storage and retrieval engine. It fully absorbs the W3C XML data model into the database, and provides standard access methods for navigating and querying XML data.
History[edit]
XMLDB was first released with Oracle 9i release 2. It was previously called Project XDB.