You are right. All the data types as mentioned in the table in Section 4.2.1 are valid values for the Define-XML v2 ItemDef/@DataType attribute.
Lex Jansen
CDISC Define-XML v2 Dev team.
Thanks Lex.
@OC developers: One more “TODO” on your list… By the way: I could update the config files to fix this error, but how can I send you a “pull request”? The bitbucket repository is desperately empty…
– Thierry
I will let the OpenCDISC guys answer your ‘pull request’ 
I get error OD0075 (Invalid ‘DataType’ value) when validating a define.xml version 2 file containing DataType=“durationDatetime”, while this is one of the values listed in the specification (section 4.2.1. Data Type Considerations, page 21). I am aware that in section 5.3.11 (ItemDef Element, page 75), under “allowable values”, we find the text:
Allowable Values: Refer to Section 4.2.1 for a list of the valid Define-XML DataType values.
Samples: For SDTM, SEND and ADaM variables one of (“text”, “float”, ”integer”, “date”, “datetime”).
Since the list given here is entitled “Samples”, I guessed that other values of section 4.2.1 are also valid: am I wrong?