You Gin & Tonic acquisition may provide an example:
Let us posit a case.
In the Universe of Px, order is not fixed
Gin , Tonic
Px+1 provides not only for fixed order (Gin always before Tonic) but
also ensures that both Gin and Tonic appear together.
Gin [and] Tonic
Gin [ampersand] Tonic
Gin [plus sign] Tonic
Px+3 the introduces the element Beverage.
- Discussion -
In terms of deprecation, the question arises if the introduction of new
elements is intended to act as syntactic sugar or to display an
ontological aspect heretofore unrevealed. For example, does the
introduction of the new element Beverage come with a recommendation to no
longer use the element Gin with the element Tonic? Or does the
introduction of the new element come with a recommendation to limit the
nesting of the older elements to specific places? Or does the introduction
come with a recommencation affecting the sequencing of the older elements?
Part of this thinking is inspired by Lou Burnard's remark: <quote>[T]he
TEI model of text: it is a model in which two distinct structural axes --
depth and sequence -- are explicitly represented.</quote>
In short, the deprecation is a phenomenon of the content modelling; the
compatibility is a phenomenon of the processing of an instance against a
content model. The two phenomena are of course linked. However they are
distinct: Do you always pour the gin before the tonic? Do you care when
you drink the mixed beverage if the gin was poured before the tonic? Yes,
because the witnessing of the ritual affects taste? No, because the
experience doesn't begin in the mixing but in the drinking?
- Summary -
A table of comparison for deprecation design might include consideration
> Francois Lachance wrote:
> >by asking if discussions have gone at the question of evolution from the
> >perspective of minimal deprecation ... might go a ways to achieving
> >not so much backwards compatability as validation under P5?
> I confess now that under Michael Beddow's malign influence I went out
> last night
> and bought a bottle of tonic water, then had and G&T. This may well explain
> why I have to ask if you could possibly expand on the above for those
> of us with deadened brains? what exactly are you suggesting?
Francois Lachance, Scholar-at-large
A calendar is like a map. And just as maps have insets, calendars in the
21st century might have 'moments' expressed in flat local time fanning out
into "great circles" expressed in earth revolution time.