XML Validation

I'm running SAP PI 7.0 SP12.

I have an iDoc to Flat file scenario and I would like to validate the outbound XML against the XML schema but I'm not sure if that is possible. I want to make sure that the data contained within the file meets the requirements of the XML schema - e.g. data types, field lengths etc. I don't think this is possible with this version of XI but would like to confirm my assumption.

Regards