Request for review of EMMA media type: application/emma+xml

Dear list,

W3C published a Candidate Recommendation for "EMMA: Extensible
MultiModal Annotation markup language" at:

I am sending this request to ask the Ietf-types list for comments on
the Media Type section of the EMMA specification following the
procedure defined at:

The Media Type section of the EMMA specification is available at:

and a plaintext copy is also available below.

MIME media type name:


MIME subtype name:


Required parameters:


Optional parameters:


This parameter has identical semantics to the charset parameter of the
application/xml media type as specified in [RFC3023] or its successor.

Encoding considerations:

By virtue of EMMA content being XML, it has the same considerations
when sent as "application/emma+xml"as does XML. See RFC 3023 (or its
successor), section 3.2.

Security considerations:

Several features of EMMA require dereferencing arbitrary
URIs. Implementers are advised to heed the security issues of
[RFC3986] section 7.

In addition, because of the extensibility features for EMMA, it is
possible that "application/emma+xml" will describe content that has
security implications beyond those described here. However, if the
processor follows only the normative semantics of this specification,
this content will be ignored. Only in the case where the processor
recognizes and processes the additional content, or where further
processing of that content is dispatched to other processors, would
security issues potentially arise. And in that case, they would fall
outside the domain of this registration document.

Interoperability considerations:

This specification describes processing semantics that dictate the
required behavior for dealing with, among other things, unrecognized

Because EMMA is extensible, conformant "application/emma+xml"
processors MAY expect that content received is well-formed XML, but
processors SHOULD NOT assume that the content is valid EMMA or expect
to recognize all of the elements and attributes in the document.

Published specification:

This media type registration is for EMMA documents as described by
this specification.

Additional information:

Magic number(s):

There is no single initial octet sequence that is always present in
EMMA documents.

File extension(s):

EMMA documents are most often identified with the extensions ".emma".

Macintosh File Type Code(s):


Person & email address to contact for further information:

Kazuyuki Ashimura, <>.

Intended usage:


Author/Change controller:

The EMMA specification is a work product of the World Wide Web
Consortium's Multimodal Interaction Working Group. The W3C has change
control over these specifications.

Normative References:

M. Murata et al., editors. XML Media Types. IETF RFC 3023, January 2001

T. Berners-Lee et al., editors. Uniform Resource Identifier (URI):
Generic Syntax. IETF RFC 3986, January 2005.



Kazuyuki Ashimura / W3C Multimodal & Voice Activity Lead
voice: +81.466.49.1170 / fax: +81.466.49.1171

Received on Monday, 28 January 2008 18:26:14 UTC