what is the purpose of registering a xml document type in oracle
Save the message.xsd XML schema on your filesystem and copy it to the /home/DEV/xsd/ folder in the XML DB repository (See Connecting To XML DB). At this point the XML schema has stored within the XML DB repository. To make XML DB aware of the XML schema it must be registered: If you like Oracle tuning, see the book Oracle Tuning: The Definitive Reference, with 950 pages of tuning tips and scripts. You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.