Media Type Registration request for POWDER and POWDER-S

[Phil Archer]

To whom it may concern,

This e-mail is sent in line with "How to Register an Internet Media Type 
for a W3C Spec" [1] and follows an earlier attempt to follow the IANA 
process (see 2, 3).

Having taken advice [4], the W3C POWDER Working Group requests that 
consideration be given to registering two Media types for POWDER and 
POWDER-S documents.

POWDER: application/powder+xml
==============================

POWDER is a constrained dialect of XML that transports RDF properties 
and objects that can be associated with multiple subjects. The media 
type details are included in Appendix B of POWDER: Description Resources 
[5] which has just completed its (second) Last Call period. The version 
cited here includes changes made in response to last call comments and 
is not yet published, however, it is the one (or very close to the one) 
the working group will present as the Proposed Recommendation. It is 
anticipated that this happen within the next 2 weeks. The relevant 
section of the Description Resources document is as follows:

Appendix B: POWDER Internet Media Type and Macintosh File Type

The following Media Type has been submitted to the IESG for review, 
approval, and registration with IANA

contact:
   Phil Archer or Matt Womer

See also:
   How to Register a Media Type for a W3C Specification
   Internet Media Type registration, consistency of use
   TAG Finding 3 June 2002 (Revised 4 September 2002)

The Internet Media Type / MIME Type for POWDER is "application/powder+xml".

It is recommended that POWDER files use the file extension of .xml (all 
lowercase) on all platforms.

It is recommended that POWDER files stored on Macintosh HFS file systems 
be given a file type of "TEXT".

Type name:
   application

Subtype name:
   powder+xml

Required parameters:
   None

Optional parameters:
   None

Encoding considerations:
   Identical to those of "application/xml" as specified in [RFC3023],
   section 3.2.

Security considerations:
   POWDER is used to make assertions, sometimes socially sensitive, about
   web resources. Consumers of POWDER should be aware of the source and
   chain of custody of this data. Security considerations for URIs
   (Section 7 of RFC 3986 [RFC3986]) and IRIs (Section 8 of RFC 3987
   [RFC3987]) apply to the extent that describing resources in POWDER may
   prompt consumers to retrieve those resources.

Interoperability considerations:
   There are no known interoperability issues.

Published specification:
   http://www.w3.org/TR/powder-dr/

Applications which use this media type:
   No known applications currently use this media type.

Additional information:
Magic number(s):
  As specified for "application/xml" in RFC 3023 [RFC3023], section 3.2.

File extension(s):
   .xml

Fragment identifiers:
   Identical to that of "application/xml" as described in RFC 3023
   [RFC3023], section 5.

Base URI:
   As specified in RFC 3023 [RFC3023], section 6.

Macintosh file type code(s):
   "TEXT"

Person & email address to contact for further information:
   public-powderwg at w3.org

Intended usage:
COMMON

Restrictions on usage:
   None

Author/Change controller:
   The POWDER specification is a work product of the World Wide Web
   Consortium's Protocol for Web Description Resources (POWDER) Working
   Group. The W3C has change control over these specifications.

POWDER-S: application/powder-s+xml
==================================

Semantic POWDER, or POWDER-S, is typically generated by performing a 
transformation on a POWDER document. Each POWDER-S document is an OWL 
ontology from which properties and values can be inferred for a given 
resource. In order for inferences to be drawn, however, OWL tools must 
implement a semantic extension (defined separately) and it is for this 
reason that a new media type is requested, rather than using the 
existing RDF/OWL media types. A POWDER-S document is valid RDF/OWL but 
is essentially meaningless without the semantic extension.

The media type details are included in Appendix C of POWDER: Description 
Resources [5] as follows:

Appendix C: POWDER-S Internet Media Type and Macintosh File Type

The following Media Type has been submitted to the IESG for review, 
approval, and registration with IANA

contact:
   Phil Archer or Matt Womer

See also:
   How to Register a Media Type for a W3C Specification
   Internet Media Type registration, consistency of use
   TAG Finding 3 June 2002 (Revised 4 September 2002)

The Internet Media Type / MIME Type for POWDER-S is 
"application/powder-s+xml".

It is recommended that POWDER-S files use the file extension of .rdf 
(all lowercase) on all platforms.

It is recommended that POWDER-S files stored on Macintosh HFS file 
systems be given a file type of "TEXT".

Type name:
   application

Subtype name:
   powder-s+xml

Required parameters:
   None

Optional parameters:
   None

Encoding considerations:
  Identical to those of "application/xml" as specified in [RFC3023],
   section 3.2.

Security considerations:
   POWDER-S is used to make assertions, sometimes socially sensitive,
   about web resources. Consumers of POWDER should-S be aware of the
   source and chain of custody of this data. Security considerations for
   URIs (Section 7 of RFC 3986 [RFC3986]) and IRIs (Section 8 of RFC 3987
   [RFC3987]) apply to the extent that describing resources in POWDER-S
   may prompt consumers to retrieve those resources.

Interoperability considerations:
   There are no known interoperability issues.

Published specification:
   http://www.w3.org/TR/powder-dr/

Applications which use this media type:
   No known applications currently use this media type.

Additional information:

Magic number(s):
   As specified for "application/xml" in RFC 3023 [RFC3023], section 3.2.

File extension(s):
   .rdf

Fragment identifiers:
   Identical to that of "application/xml" as described in RFC 3023
   [RFC3023], section 5.

Base URI:
   As specified in RFC 3023 [RFC3023], section 6.

Macintosh file type code(s):
   "TEXT"

Person & email address to contact for further information:
   public-powderwg at w3.org

Intended usage:
   COMMON

Restrictions on usage:
   None

Author/Change controller:
   The POWDER-S specification is a work product of the World Wide Web
   Consortium's Protocol for Web Description Resources (POWDER) Working
   Group. The W3C has change control over these specifications.

Please advise if there is any missing or incorrect information in this 
request.

Yours faithfully

Phil Archer
POWDER WG Chair.


[1] http://www.w3.org/2002/06/registering-mediatype
[2] http://lists.w3.org/Archives/Public/public-powderwg/2008Dec/0001.html
[3] http://lists.w3.org/Archives/Public/public-powderwg/2008Dec/0002.html
[4] For example 
http://lists.w3.org/Archives/Public/public-powderwg/2008Dec/0026.html 
and http://lists.w3.org/Archives/Public/public-powderwg/2008Dec/0012.html
[5] http://www.w3.org/2007/powder/Group/powder-dr/20081205.html



-- 
Phil Archer
w. http://philarcher.org/