Loading XML documents to Oracle 11g DB with control file
I think the way you'll have to do it is a Jokke suggest: instead of defining the DT datatype as TIMESTAMP WITH TIME ZONE, rather define it as VARCHAR2(29) where I think that 29 characters should be enough but you could define it wider.

Then when you extract data from the XML you'll have to convert it to TIMESTAMP WITH TIME ZONE.

However, you could also define the column as an "xsd:dateTime". See http://www.adp-gmbh.ch/xml/schema.html and http://www.w3.org/TR/xmlschema-2/#dateTime