Xmltype() does validation?

Hi,
I'm trying to read xml content from a clob field. I try to extract "headers" and only after this I want the xml content to be validated.
Here's my statement:
SELECT xml.message_sgw_id,
xml.message_source_system_id,
xml.message_type_id,
xml.action,
xml.time_generated
FROM RT_MESSAGE_QUEUE Q,
XMLTABLE(XMLNAMESPACES('http://www.w3.org/2001/XMLSchema-instance' AS
"xsi",
'http://www.my_ns.com/xml' AS "my_ns"),
'/my_ns:my_nsDocument' PASSING(Q.MESSAGE_BODY)
COLUMNS message_sgw_id VARCHAR2(50) PATH
'/my_ns:my_nsDocument/my_ns:my_nsObject/my_ns:identification/my_ns:versionedIdentifier/@code',
message_source_system_id VARCHAR2(25) PATH
'/my_ns:my_nsDocument/my_ns:my_nsObject/@sourceSystem',
message_type_id VARCHAR2(50) PATH
'/my_ns:my_nsDocument/my_ns:my_nsObject/@xsi:type',
action VARCHAR2(50) PATH
'/my_ns:my_nsDocument/my_ns:my_nsObject/@action',
time_generated VARCHAR2(30) path
'/my_ns:my_nsDocument/my_ns:my_nsObject/@xmlCreationTimeStamp') xml
WHERE Q.SEQUENCE = 363
I registererd the schema('s because I use includes) but I don't want the xml content to be validated at this point, I just want to read what's inside.
As the message_body column is of type clob I need to cast it to xmltype.
However I always get an ORA-30937 saying something is wrong against the schema.
Is there a way to bypass this implicit validation of the xmltype() conversion function?
Thanks!

If this may be of any help to solve my problem:
I've got other xml message in the queue table that are invalid and the above select statement produces no error, the xmltable function works fine althrough the message is invalid against the schema.
Here are some error messages above query gives me on various messages that are invalid against the schema:
ORA-30937: No schema definition for 'structureType' (namespace 'http://www.my_ns.com/xml') in parent '/my_nsDocument/my_nsObject[1]/product/definition'
ORA-30936: Maximum number (1) of 'book' XML node elements exceeded
ORA-30937: No schema definition for 'currencyPair' (namespace 'http://www.my_ns.com/xml') in parent '/my_nsDocument/my_nsObject[1]/product/definition'
I've got other messages that are invalid that CAN be read by the above query, validation errors are then in XMLSPY:
Unexpected element 'my_ns:role' in element 'my_ns:tradeParty'. Expected 'my_ns:legalEntity', 'my_ns:book'
Why does the query returns an error on some invalid xml's and does not on other invalid xml's?

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Thanks
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::COPY OF HELP QUESTION SUBMITTED::
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::ANSWER SUBMITTED BY COMMUNITY EXPERT::
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Answered by Thom Parker on Fri, Jul 6, 2007
::RESPONSE FROM ME BACK::
Q:After reading through the Picture Clause Reference I'm certain there is no way to validate the customer name field without first knowing how many characters will be entered in. And I'm pretty sure there is no simple way of just making it "required" without a pattern to verify against.
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