Constrain text emphasis position to 'outside'

[palemieux]

Close #15

[nigelmegitt]

Is there now a more expressive TTML2 feature designator we can use in place of this?

[palemieux]

@nigelmegitt What do you mean by "more expressive"?

[nigelmegitt]

I mean one that more accurately maps to support for/use of the outside value.

[palemieux]

None of the emphasis features relate specifically to the <emphasis-position> component of tts:textEmphasis

[nigelmegitt]

Oh, I see that the #textEmphasis-no-XXX features are negative features rather than positive ones. I didn't notice that before. I think it's broken in TTML2 and will raise an issue for this: features should be positively stated not negatively, otherwise the future introduction of additional syntax and semantics will change the meaning of existing -no-XXX style feature designators.

Raised as w3c/ttml2#697.

[nigelmegitt]

Oh, I see that the #textEmphasis-no-XXX features are negative features rather than positive ones. I didn't notice that before. I think it's broken in TTML2 and will raise an issue for this: features should be positively stated not negatively, otherwise the future introduction of additional syntax and semantics will change the meaning of existing -no-XXX style feature designators.

Raised as w3c/ttml2#697.

[nigelmegitt]

This is ambiguous: it could mean

1. only position semantics are required, and only the value outside needs to be supported, OR
2. of the position semantics, only the value outside needs to be supported, but emphasis-style does also need to be supported, barring quoted strings as excluded by #textEmphasis-minimal

Please could you clarify this @palemieux ?

[palemieux]

I would say (2).

[palemieux]

Will correct to of position semantics, only is supported

[nigelmegitt]

@palemieux OK, looking forward to reviewing the change.

[palemieux]

@nigelmegitt For your review

[nigelmegitt]

Thanks!