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Allow for UUIDv1, there is no specification of version in the spec.
see: https://github.com/adlnet/xAPI-Spec/blob/master/xAPI-Data.md#44-uuids
and
adlnet/xAPI-Spec#535
The only requirement for UUIDs are that they are variant 2, any version of variant 2 is valid.
Due to security reasons I agree that we should only accept v4 but that restriction is not specified.