Request for review of Turtle (an RDF serialization) media type: text/turtle

[Eric Prud'hommeaux]

W3C is about to publish a Team Submission for the RDF serialization
Turtle. A mockup of the document to be published is at
  http://www.w3.org/2007/11/21-turtle

Because the document will include the text of the media type
registration, I am vetting this registration with ietf-types before
publishing the document. Some discussion about the claim to force
utf-8 encoding (and not require that in a charset parameter) can be
seen at http://lists.w3.org/Archives/Public/www-archive/2007Dec/
(Subject: Media types for RDF languages N3 and Turtle)
I got moderator-actioned for having too many folks in the Cc so
I'm Bcc'ing them all in this request for review:

"Sean B. Palmer" <sean at miscoranda.com>, Tim Berners-Lee <timbl at w3.org>,
"Daniel W. Connolly" <connolly at w3.org>, Dave Beckett <dave at dajobe.org>,
Lee Feigenbaum <lee at thefigtrees.net>, Garret Wilson <garret at globalmentor.com>,
Graham Klyne <GK at ninebynine.org>, Dan Brickley <danbri at danbri.org>,


Type name:
  text

Subtype name:
  turtle

Required parameters:
  None

Optional parameters:
  None

Encoding considerations:
  The syntax of Turtle is expressed over code points in
  Unicode[UNICODE].  The encoding is always UTF-8 [RFC3629]; the
  charset parameter is not needed; though it may be included so
  long as the value is 'UTF-8'.

  Unicode code points may also be expressed using an \uXXXX (U+0 to
  U+FFFF) or \UXXXXXXXX syntax (for U+10000 onwards) where X is a
  hexadecimal digit [0-9A-F]

Security considerations:
  Turtle uses IRIs as term identifiers. Applications interpreting data
  expressed in Turtle sould address the security issues of
  Internationalized Resource Identifiers (IRIs) Section 8, as well as
  Uniform Resource Identifier (URI): Generic Syntax [RFC3986] Section 7

  Multiple IRIs may have the same appearance. Characters in different
  scripts may look similar (a Cyrillic "o" may appear similar to a Latin
  "o"). A character followed by combining characters may have the same
  visual representation as another character (LATIN SMALL LETTER E
  followed by COMBINING ACUTE ACCENT has the same visual representation
  as LATIN SMALL LETTER E WITH ACUTE). Any person or application that
  is writing or interpreting data in Turtle must take care to use the
  IRI that matches the intended semantics, and avoid IRIs that make look
  similar. Further information about matching of similar characters can
  be found in Unicode Security Considerations [UNISEC] and
  Internationalized Resource Identifiers (IRIs) [RFC3987] Section 8.

Interoperability considerations:
  There are no known interoperability issues.

Published specification:
  TBD, in the mean time, see http://www.w3.org/2007/11/21-turtle

Applications which use this media type:
  No widely deployed applications are known to use this media type. It
  may be used by some web services and clients consuming their data.

Additional information:

Magic number(s):
  Turtle documents may have the strings '@prefix' or '@base' (case
  dependent) near the beginning of the document.

File extension(s):
  ".ttl"

Base URI:
  The Turtle '@base <IRIref>' term can change the current base URI for
  relative IRIrefs in the query language that are used sequentially
  later in the document.

Macintosh file type code(s):
  "TEXT"

Person & email address to contact for further information:
  Eric Prud'hommeaux <eric at w3.org>

Intended usage:
  COMMON

Restrictions on usage:
  None

Author/Change controller:
  The Turtle specification is the product of David Beckett and Tim
  Berners-Lee. A W3C Working Group may assume maintenance of this
  document; W3C reserves change control over this specifications.


Normative References

[RFC3023] Murata, M., St. Laurent, S., and D. Kohn, "XML Media Types",
          RFC 3023, January 2001.

[RFC3629] F. Yergeau, "UTF-8, a transformation format of ISO 10646",
          RFC 3629, November 2003.

[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
          Resource Identifier (URI): Generic Syntax", STD 66, RFC
          3986, January 2005.

[RFC3987] Duerst, M. and M. Suignard, "Internationalized Resource
          Identifiers (IRIs)", RFC 3987, January 2005.

[UNICODE] The Unicode Standard, Version 4. ISBN 0-321-18578-1, as
	  updated from time to time by the publication of new
	  versions. The latest version of Unicode and additional
	  information on versions of the standard and of the Unicode
	  Character Database is available at
	  http://www.unicode.org/unicode/standard/versions/.

[UNISEC]  Mark Davis, Michel Suignard, "Unicode Security
          Considerations.
          http://www.unicode.org/reports/tr36/

-- 
-eric

office: +1.617.258.5741 NE43-344, MIT, Cambridge, MA 02144 USA
mobile: +1.617.599.3509

(eric at w3.org)
Feel free to forward this message to any list for any purpose other than
email address distribution.
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