The Quantities, Dimensions, Units, Values model is currently proposed as part of Version 1.2 of the OMG SysML specification. (2311)
The SysML QUDV project has its own wiki page at http://www.omgwiki.org/OMGSysML/doku.php?id=sysml-qudv:quantities_units_dimensions_values_qudv. The draft Annex C.5 of the SysML 1.2 specification presenting the QUDV model is available from this page, along with additional background information and initial work toward an OWL version of this model. (2312)