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RE: [xml-dev] Data versioning strategy: address semantic, relationship, and syntactic changes?

Question:  Is the data versioning problem one of the versioning process or
one of identifying a version and proving its goodness (as in prior to using
it in production)?

I ask because Greg noted privately that a phase transition is dependent on
the observer.  I replied that in some cases, say a phase transition from
water to ice or ice to vapor, the transition is observer-independent.  A
transition of a development code base to a release code base is
test-dependent but should be the same for all observers using the version.
A phase change from a development version to a release version goes to the
heart of a primary difficulty of versioning beyond proof of goodness:
distribution or maintenance of the same phase or different phases on
different platforms.

The challenge of a phase metaphor is declaring and measuring the critical
control variable.

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