[ttml2] Clarify use of lexical expression '-0' and its semantics.

skynavga has just created a new issue for https://github.com/w3c/ttml2:

== Clarify use of lexical expression '-0' and its semantics. ==
In particular, need to reduce ambiguity around phrases negative and non-negative as well as the difference between `<non-negative-integer>`, which does not support `-0`, and `xsd:nonNegativeInteger`, which does admit `-0`.

Please view or discuss this issue at https://github.com/w3c/ttml2/issues/985 using your GitHub account

Received on Thursday, 6 September 2018 15:38:01 UTC