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[Slim] #40 Syntax Extensibility

Natasha Rooney <nrooney@gsma.com> Thu, 08 June 2017 17:27 UTC

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From: Natasha Rooney <nrooney@gsma.com>
To: "slim@ietf.org" <slim@ietf.org>
Thread-Topic: #40 Syntax Extensibility
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Subject: [Slim] #40 Syntax Extensibility
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Hi all,

https://trac.ietf.org/trac/slim/ticket/40

Ticket #40 discusses enhancing the syntax for the benefit of extensibility. Please review this and respond (author and all WG attendees). Please see the original text from Paul Kyzivat:

--------------------------------------------------------

How about enhancing the syntax to support parameters for the values, but only as a future extension mechanism? Unknown parameters to be ignored. Then at least the hooks will be there to introduce something later if desired.

I think this would be the wise thing to do in any case. But especially so since we have have some issues pending that have been postponed as potential future work.

Here is a specific proposal so we have something concrete to discuss:

hlang-value-list = hlang-value *("," hlang-value)

hlang-value = (Language-Tag / asterisk) *(";" hlang-param)

hlang-param = hlang-param-name hlang-param-value?

hlang-param-name = token

hlang-param-value = token

asterisk = "*" ; an asterisk (ASCII %2A) character

Language-Tag = <Defined in BCP 47>

token = <Defined in RFC4566>

(I am *not* particularly attached to the specifics, but rather just to the general notion of having an extensibility hook. If you have issues with the syntax details I'm happy to discuss alternatives.)

No specific hlang-params are to be defined in this draft. The semantics are that unknown hlang-params are to be ignored, and specific ones can be defined in extension drafts.

Natasha Rooney | Internet Engineering Director | Internet and Web Team | Technology | GSMA | nrooney@gsma.com<mailto:nrooney@gsma.com> | +44 (0) 7730 219 765 | @thisNatasha | Skype: nrooney@gsm.org<mailto:nrooney@gsm.org>


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