You need it if you want to validate documents against the schema of a
specific version, that's true. You should not need it most other cases.
I beg to differ on that. Any xml processing will need to know what
elements attributes to expect.
If it is added, will your proposal still be valid?
Yes, it will. But maybe there is some misunderstanding. My proposal is
not a proposal for defining conformance in OpenDocument v1.2 itself. But
it is a proposal for guidelines which extensions we should accept for
ODF 1.2, and which require a deeper discussion before we know whether we
accept them for ODF 1.2.
The proposal could create a lot of confusion.
When I open a document I will be unable to tell if it is 1.1 or 1.2
(unless the implementation decides to include the version).
How do I request a feature please?
That this attribute become required from 1.2 onwards.