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Re: [MMUSIC] RID Open Issue 3: Escaping in Extension Parameters

Peter Thatcher <pthatcher@google.com> Mon, 02 November 2015 04:46 UTC

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From: Peter Thatcher <pthatcher@google.com>
Date: Sun, 01 Nov 2015 20:45:28 -0800
Message-ID: <CAJrXDUEvV3rM=i4U3mzjDVGoT5V9GJKQ9KYjOuJPmjxxXCWEoA@mail.gmail.com>
To: Adam Roach <adam@nostrum.com>
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Subject: Re: [MMUSIC] RID Open Issue 3: Escaping in Extension Parameters
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I like #3.  It's hard to know what escaping would make sense without
knowing what we'll be escaping.  Let's cross that bridge when we come to
it.

On Sun, Nov 1, 2015 at 8:42 PM, Adam Roach <adam@nostrum.com> wrote:

> The parameters on an “a=rid:” line are extensible. The syntax for these is:
>
>    rid-param-other = 1*(alpha-numeric / "-") [ "=" param-val ]
>    param-val = *( %x20-58 / %x60-7E ) ; Any printable character except
> semicolon
>
> If an extension has values that can contain semicolons, they need an
> escaping mechanism. Note that this is not an issue for any currently
> defined parameters, as they all take numeric values only.
>
> 1. Change extension syntax to only allow numeric values
> 2. Define a universal escaping mechanism for all extensions to use
> 3. Leave this problem for the first extension parameter – if any – to
>    define value in a way that might allow a semicolon
>
> Thoughts?
>
> /a mmusic-rid.pptx mmusic-rid.pptx
>
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