This was written for TMRA'08 together with Rani Pinchuk and Xuân Baldauf.
Improvements to XTM 2.0 are suggested in this paper. First, a set of criteria is defined for evaluating those improvements. It is followed by the suggestions themselves: align element names with the names used in TMDM, reduce the number of elements by introducing mixed content and using attributes whenever it is possible. Finally, some relevant irregularities are discussed.
See the paper in the attachment.