MPEG asks for MIME review for the MPEG21 file format

[Graham Klyne]

[Restricting mailing list circulation to ietf-types for now]

Christian,

Thank you for the references - they are most helpful.

>From part 1, and referring back to the proposed MIME type registration, posted at:
  http://www.alvestrand.no/pipermail/ietf-types/2007-May/001804.html
it becomes clear that the content is NOT the DIDL which is what I had first thought.

Is there any chance that the standardization committee might be persuaded to
make public release of part 9, describing this file format, in addition to parts
1, 2 and the schema already made public?  I think that doing so would make the
MPEG21 vision accessible to a wider base of developers.

#g
--


Christian Timmerer (ITEC) wrote:
>  
> 
> Dear all,
> 
>   as the “source” of this MIME type please apologize my late reply
> because I was one week w/o email access. It took some time to catch up.
> Regarding the “+xml” suffix I agree that it is inappropriate since an
> MPEG-21 file is not purely XML (see below for further details).
> 
>  
> 
> MPEG-21 Part 1 (Technical Report) is publicly available [1].
> 
>  
> 
> Concerning Digital Items, Digital Item Declaration, and MPEG-21 File
> Format, let me try to clarify something because I think there’s a
> misunderstanding:
> 
> ·         A Digital Item can be seen as a digital container format that
> puts (media) resources (e.g., audio, video, image, text (PDF), etc.) and
> metadata (e.g., data describing the resources, licenses, identifiers,
> etc.) within a standardized structure.
> 
> ·         A Digital Item is declared by an Digital Item Declaration
> (DID) which is based on the Digital Item Declaration Language (DIDL)
> that is a representation of the Digital Item Declaration Model. The
> model and DIDL are specified in MPEG-21 Part 2 which is publicly
> available [2]. The model is an abstract model defined using EBNF whereas
> DIDL – the representation of the model – is defined using XML Schema,
> thus, DID is XML-based. That is, it is possible that other,
> non-XML-based representation may be derived from the model (However,
> this should not be the discussion point)
> 
> ·         A Digital Item may be distributed which means that its
> declaration (i.e., DID) may be at one location whereas its (media)
> resources and metadata may be located elsewhere on various locations.
> 
> ·         The MPEG-21 file puts everything, i.e., (media) resources,
> metadata, and structure (i.e., declaration), into one file, the MPEG-21
> file which is binary and contains the DID and (maybe) also the
> referenced/included (media) resources.
> 
>  
> 
> Hope this information is helpful for you.
> 
>  
> 
> Thank you.
> 
> Best regards,
> 
>  -Christian
> 
>  
> 
> [1]
> http://standards.iso.org/ittf/PubliclyAvailableStandards/c040611_ISO_IEC_TR_21000-1_2004(E).zip
> 
> [2]
> http://standards.iso.org/ittf/PubliclyAvailableStandards/c041112_ISO_IEC_21000-2_2005(E).zip


-- 
Graham Klyne
For email:
http://www.ninebynine.org/#Contact