Added Bill Cleveland (NASA Ames' SimLab) and Brent York (NAVAIR's Manned Flight Simulator) to the acknowledgements section, to thank them for their pioneering initial trials of DAVE-ML.

Added <provenanceRef> element and changed all parents of <provenance> elements to be able to use a <provenanceRef> reference instead (these were <function>, <griddedTableDef> and <ungriddedTableDef>) to eliminate duplicate <provenance> elements.

Realization dawned that there was little difference between <griddedTable> and <griddedTableDef>s but the latter was more flexible (ditto <ungriddedTable> and <ungriddedTableDef>s). By making the gtID and utID attributes "implied" instead of "required," we can use the Def versions in both referenced-table and embedded-table <function>s. Thus the original <griddedTable> and <ungriddedTable> elements have been marked as "Deprecated." They are still supported in this DTD for backwards compatibility but should be avoided in future use; the easiest way to modify older DAVE-ML models would be to rename all <griddedTable>s as <griddedTableDef>s.