[Bug 16540] Provide guidelines on Key System string format

https://www.w3.org/Bugs/Public/show_bug.cgi?id=16540

--- Comment #9 from David Dorwin <ddorwin@google.com> ---
It was also pointed out at the F2F that if version detection was supported in
some way, "supports minimum version" might be the more helpful thing to check
instead of exact version matching.

I agree that the use cases are probably better served with some type of feature
detection and support removing references to versions in key systems [1].

I think there might still be use cases for some type of structure. For example,
some key systems may choose to expose parent systems, such as "com.example",
via isTypeSupported(). For those key systems that do, I think UAs should also
expose them, though we don't need to specify exact variations in the spec.

The current draft does not actually say much about prefix matching or
subsystems (v0.1b said a bit more). After deleting the version references, it
might be good to provide a non-normative note that there may be such variations
and that UAs should pass through variations for key systems that support it.

[1] Key System definition, isTypeSupported() examples, Selecting a Supported
Key System example

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Received on Thursday, 9 May 2013 03:36:12 UTC