[Cellar] namespace considerations for ebml's definition of EBML Schema

Dave Rice <dave@dericed.com> Thu, 16 July 2020 18:03 UTC

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Date: Thu, 16 Jul 2020 14:02:53 -0400
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Subject: [Cellar] namespace considerations for ebml's definition of EBML Schema
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Hi cellar,
This is a late comment in regards to the EBML document, but I’m considering this dialogue.

>>>>>>> Begin forwarded message:
> From: Karen Moore <kmoore@amsl.com>
> Subject: [AD - Murray] Re: AUTH48 [KC][SW]: RFC 8794 <draft-ietf-cellar-ebml-17.txt> NOW AVAILABLE
> Date: July 16, 2020 at 1:53:35 PM EDT
> To: "Murray S. Kucherawy" <superuser@gmail.com>om>, Steve Lhomme <slhomme@matroska.org>rg>, Dave Rice <dave@dericed.com>om>, Moritz Bunkus <moritz@bunkus.org>
> Cc: RFC System <rfc-editor@rfc-editor.org>rg>, Alexey Melnikov <aamelnikov@fastmail.fm>fm>, cellar-ads@ietf.org, cellar-chairs@ietf.org, Steven Villereal <villereal@gmail.com>
>>>>>>>> 3) In the XML Schema for EBML Schema, the URL https://ietf.org/cellar/ebml <https://ietf.org/cellar/ebml>
>>>>>>>> is provided, but it doesn't seem to be a valid site. Please confirm that this
>>>>>>>> is okay.
>>>>>>>> -->
>>>>>>> I don't suppose we could host it on the IETF website. I'm not sure if
>>>>>>> a valid URL is necessary here, this is just a marker for a namespace.
>>>>>>> I think it only needs to be unique so that it's not mistaken with an
>>>>>>> XSD with a same name.

Within the EBML Schema example xml and the EBML Schema XSD the value of https://ietf.org/cellar/ebml <https://ietf.org/cellar/ebml> is used as an undefined and stand-in namespace. From reviewing other RFCs which define XML Schemas, I see that they don’t use this style of URL but instead use a URN guided by RFC2648.

Should we consider adding a section such as the one quoted below and changing from https://ietf.org/cellar/ebml to urn:ietf:params:xml:ns:ebml?

> ### `<EBMLSchema>` Namespace
> The namespace URI for elements defined by this specification is a URN as
> defined by [@!RFC2141] that uses the namespace identifier 'ietf' defined by
> [@!RFC2648] and extended by [@!RFC3688]. This URN is:
> ```
> urn:ietf:params:xml:ns:ebml
> ```

and changing from https://ietf.org/cellar/ebml to urn:ietf:params:xml:ns:ebml. This would follow the recommendation at https://tools.ietf.org/html/rfc3470#section-4.9 <https://tools.ietf.org/html/rfc3470#section-4.9>.

Dave Rice