Where can I find MultiTerm mtf schema specification in xsd format?

To create validating and error-free MultiTerm import files, I am looking for an approved xsd file that specifies the MultiTerm mtf schema. I've only found an .xdr version of it (in the MultiTerm Desktop SDK.chm online help), with latest edits dating back to 2003... Since XDR is no longer supported, I am looking for an xsd version of the mtf specification. Is there one available somewhere?