All products / terms are derived from a an object that re-defiend tha artifact inside WS-Calendar Intervlas and Gluons. Several of the interactions may not have an MRID in all transactions, such as requested load shed within an area (as opposed to from aparticular node id). All Term types now include an identifier, whether resource or area, and all are now derived from the Artifact lass (which was not true before). Good catch.