We describe our experiences importing PASS provenance into PLUS.
Although both systems import and export provenance that conforms to the
Open Provenance Model (OPM), the two systems vary greatly with
respect to the granularity of provenance captured, how much semantic
knowledge the system contributes, and the completeness of provenance
capture. We encoun- tered several problems reconciling provenance between
the two systems and use that experience to specify a Common Provenance
Framework, that provides a higher degree of interoperability between
provenance systems. In each case, the problems stem from the fact that
OPM interoperability is a weaker requirement than query inter-
operability. Our goal in presenting this work is to gener- ate discussion
about differing degrees of interoperability and the requirements thereof.