IPP> Re: MOD - Confusion about image/tiff MIME Content Type

IPP> Re: MOD - Confusion about image/tiff MIME Content Type

IPP> Re: MOD - Confusion about image/tiff MIME Content Type

Hastings, Tom N hastings at cp10.es.xerox.com
Fri Feb 19 18:45:20 EST 1999


Jim,

The current IPP/1.1 I-D Model and Semantics draft has examples for
mimeMediaTypes to show some useful parameters for 'text/plain' so that
people get the idea about parameters on media types.

Should we add the faxbw and faxcolor parameters as examples to 'image/tiff'?

Then we would have three examples in the IPP Model and Semantics section
4.1.9:

   'image/tiff':  Tag Image Format - see IANA MIME Media Type registry
   'image/tiff; application=faxbw':  Tag Image Format - black and white
profile or subset of TIFF for Facsimile.  see IANA MIME Media Type registry
   'image/tiff; application=faxcolor':  Tag Image Format - color profile or
subset of TIFF for Facsimile.  see IANA MIME Media Type registry

Thanks,
Tom



Here is what we have in our Internet-Draft draft-ietf-ipp-model-v11-00.txt:

4.1.9 'mimeMediaType'

The 'mimeMediaType' attribute syntax is the Internet Media Type (sometimes
called MIME type) as defined by RFC 2046 [RFC2046] and registered according
to the procedures of RFC 2048 [RFC2048] for identifying a document format.
The value MAY include a charset parameter, depending on the specification of
the Media Type in the IANA Registry [IANA-MT].  Although most other IPP
syntax types allow for only lower-cased values, this syntax type allows for
mixed-case values which are case-insensitive.

Examples are:
  
'text/html': An HTML document
'text/plain': A plain text document in US-ASCII (RFC 2046 indicates that in
the absence of the charset parameter MUST mean US-ASCII rather than simply
unspecified) [RFC2046].
'text/plain; charset=US-ASCII':  A plain text document in US-ASCII [52, 56].
'text/plain; charset=ISO-8859-1':  A plain text document in ISO 8859-1
(Latin 1) [ISO8859-1].
'text/plain; charset=utf-8':  A plain text document in ISO 10646 represented
as UTF-8 [RFC2279]
'application/postscript':  A PostScript document [RFC2046]
'application/vnd.hp-PCL':  A PCL document [IANA-MT] (charset escape sequence
embedded in the document data)
'image/tiff':  Tag Image Format - see IANA MIME Media Type registry
'application/pdf':  Portable Document Format - see IANA MIME Media Type
registry
'application/octet-stream':  (REQUIRED) Auto-sense - see below



>-----Original Message-----
>From: James Rafferty [mailto:jrafferty at worldnet.att.net]
>Sent: Friday, February 19, 1999 07:29
>To: Hastings, Tom N; Keith Moore; Hastings, Tom N
>Cc: Masinter, Larry <masinter at parc.xerox.com>; McIntyre, 
>Lloyd; Buckley,
>Robert R; Zilles, Steve; venable at wrc.xerox.com; 
>Glenn.Parsons at nortel.ca;
>ipp; ifx at pwg.org
>Subject: RE: IPP> Re: MOD - Confusion about image/tiff MIME 
>Content Type
>
>
>
>Tom, 
>
>At 03:46 PM 2/18/99 -0800, Hastings, Tom N wrote:
>>Keith,
>>
>>Thanks.  So it looks like the IPP Model and Semantics 
>'mimeMediaType' value
>>of 'image/tiff' should point to the IANA Registry, not a 
>particular RFC.  
>>
>Yes, I'd agree with this.   
>>For future work and an extension to IPP to be developed in 
>the IFAX over IPP
>>WG, we will need to solve the Interoperability Considerations 
>problem called
>>out below where there are different profiles for TIFF.
>>
>Please note that there is one additional IANA consideration that was
>specified in Annex B of RFC 2301, on the two values that HAVE been
>specified for the TIFF application parameter ("faxbw" and 
>"faxcolor" ).   I
>have pointed out this omission to Keith Moore, so that IANA 
>hopefully can
>finish bringing the image/tiff registry up to date.   Also, please note
>that RFC 2302 also contains a template for the registration of 
>future TIFF
>application parameter values, if they are needed.     
>
>James
>
>*------------------------------------------------*
>James Rafferty			
>President, Human Communications LLC	
>12 Kevin Drive			
>Danbury, CT  06811-2901		
>USA					
>Voice/Fax:  +1-203-746-4367
>Email/Internet Fax:  JRafferty at worldnet.att.net
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>     jrafferty at humancomm.com
>
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>*---------------------------------------------------
>



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