[Moose-dev] What is the relevence of referenceVersion in Hismo?

In the description of Girba, 2005, "Modeling History to understand Software Evolution", there is a small statement on "referenceVersion" in the Hismo metamodel: "Each Version has a reference to the so called referenceVersion which provides a fixed point in the historical space." This is implemented in Moose Hismo, but there is little description of its relevence to modelling. What is meant by "fixed point in the historical space"? In fact, there is an interface to set it to easily set it to nil!! (HismoEntityVersion class >> with:inHistory:) Can Tudor or someone else able to describe why referenceVersion would be important in time based analysis? Could this be, for example, the "baseline" to which other copies are compared? Can we have a different referenceVersions in different HismoHistoryGroups? Can we change the referenceVersion on the fly during analysis? I can see hints in the names of methods (e.g. isBornPriorToOrInReferenceVersion), but I can't quite catch the semantics. Can you give some guidelines on which version should be selected as the referenceVersion, and why? As I've described earlier, I'm trying to analyse different versions of system development schedules. I'm trying to use the Hismo framework to its best advantage, so I'm trying to understand the semantics as well as the code. Alan. -- View this message in context: http://forum.world.st/What-is-the-relevence-of-referenceVersion-in-Hismo-tp… Sent from the Moose mailing list archive at Nabble.com.