Eliot,
On the one hand you say:
> I don't think it's going to come as a surprise to any 1.1 user that 1.2 is a significant change to DITA
and on the other you say:
> DITA 1.2 is fully backward compatible with DITA 1.1
Even if DITA 1.2 is fully backward compatible with DITA 1.1 in some legalistic sense (I'm not agreeing that it is), I hope you can see that some people might not be expecting "significant change" to existing specializations/customizations when they upgrade to a new "compatible" version of the spec.
-Jeff
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