Not sure on your question:  "What context?"  I'll try to explain but I may
not be addressing what you may be wanting to know.
I have a set of schedule files (MS Project files converted to XML) which are
different versions of the same schedule, but updated at different times.  My
project is Kleio, so I've taken the Hismo metamodel for evolution -
(History, Version, Snapshot - from Girba, 2005) and created 3 new classes:
KleioScheduleHistory (subclass of HismoAbstractHistory)
KleioScheduleVersion (subclass of HismoEntityVersion)
KleioSchedule (subclass of MooseEntity)
(These are analogues to, say, HismoClassHistory, HismoClassVersion and
FAMIXClass.)
I've simplified this somewhat, as there are also Activities (Tasks) and
Resources to consider.  These are not important to my question.
When I load the schedule data into these classes, I first create one
KleioScheduleHistory for the set of schedules (the history).  I then create
a KleioSchedule for each schedule (the snapshots), and finally I create an
instance of KleioScheduleVersion (the versions) for the snapshot using:
KleioScheduleVersion class >> with: aVersionEntity inHistory: aHistory
withReferenceVersion: aReferenceVersion.
This creator method is a modified version of HismoEntityVersion class >>
with: aVersionEntity inHistory: aHistory withReferenceVersion:
aReferenceVersion.  Rather than inherit this creator method from
HismoEntityVersion, I've re-written it, as the HismoEntityVersion only works
for sub-classes with a name starting with Hismo (see source - 'Hismo' is
hard wired as the class prefix!!  bad karma).
So far, so good.
*My question however is:*
What is the significance of the attribute aReferenceVersion in the creator
method with:inHistory:withReferenceVersion for the HismoEntityVersion (and
so KleioScheduleVersion) class?
What problem is it trying to solve? i.e. /*Why*/ does the HismoEntityVersion
creator method have this field as an attribute?  I can set it to nil, but
what functionality in the Hismo framework would I then be missing?
Alan.

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