Most of the polytonic precomposed vowels are in the auxiliary exemplars for 
Modern Greek.
I don't know – probably because of the Katharevousa legacy and the fact that Ancient Greek lives on in literary idioms, for which you ordinarily don't use a macron for reasons of orthographic convention. (And as for the breve, you shouldn't be needing it anyways.) It doesn't really matter what the precise reason is: the two are different languages, so "it's not in D, so it shouldn't be in A" is a /non sequitur/, esp if you know that D is a typographically smaller language in a number of respects. Or maybe someone made mistakes.

One doesn't use the vowels with breve and macron for writing Ancient Greek in 
plain text; one uses them for writing about it.
I can see good rationale for having macron-based characters with diacritics in a /font meant to be able to represent Ancient Greek/, though I sense there was earlier confusion ;-) in this thread about different uses of breves and macrons, ultimately rooted in

 * an outdated terminology talking of syllable "length" for weight
 * some lexicographic imprecision
 * at least two use cases: vowel length and scansion

(and this is of course orthogonal to the precomposition question), but breve and macron belong tmk not into Demotic, so if your reasoning were "everything in D needs to be in A" because D is a typographic subset of A (and I don't think it is) that wouldn't work either.

Were you referring
auxiliary exemplar characters for Modern Greek
to this?
http://www.unicode.org/repos/cldr-tmp/trunk/dropbox/mark/exemplars/summary.html
If so, you just
A CLDR entry could get rather silly when deciding on the Attic, Ionic and Doric 
Greek for Yoruba and !Xu - Cambodia's going to be bad enough.  Do we look for 
the Ancient Greek representation of Kambuja?
successfully lost me here :-)

It depends on what criteria get applied for the CLDR entry.
Note that I wasn't really arguing for specific inclusion or exclusion, just saying that it's unclear why D is used for an argument about A.

Stephan

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