Re: [xml-dev] Data versioning strategy: address semantic, relatio nship,

["Greg Hunt" <greg@firmansyah.com>]

Actually Len, I was observing that if you use phase changes as an analogy for change control, phase changes have to be dependent on the observer, because different observers experience the impact of changes in radically different ways.  I was not suggesting that that happened in the natural world (hence the reference to Heisenberg in the original email).  The majority of change problems are not in getting out of test, they are in assessing the impact on the recipient.

On 12/12/07, Len Bullard <len.bullard@uai.com> wrote:

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.

len
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