Database Software

Hi Mark and other gurus,
I am trying to validate the XML instance against the schema using the sample this code I found in Oralce docs,

DECLARE
xmldoc XMLType;
BEGIN
-- Populate xmldoc (for example, by fetching from table).
-- Validate against XML schema
xmldoc.isSchemaValid('http://www.oracle.com/PO.xsd');
IF xmldoc.isSchemaValid = 1 THEN --
ELSE --
END IF;
END;

in my function that generates the XML data (I have posted here two days ago asking for help to avoid the empty tags). I copied the function name from the sample. But I get this error,

PLS-00221: 'ISSCHEMAVALID' is not a procedure or is undefined

We are on 9.2 and I thought it was because 9.2 did not have that, so I tried it in 10.2. But I get the same error.

Please help. Thank you.

Ben