XP> RE: Multiple Referenced Images With Same Content Location

XP> RE: Multiple Referenced Images With Same Content Location

BIGELOW,JIM (HP-Boise,ex1) jim.bigelow at hp.com
Tue Jan 28 13:43:31 EST 2003


> -----Original Message-----
> From: WISSENBACH,DAVID (HP-Boise,ex1) 
> ...
> I'd change the paragraph in B.2 to the following:
> 
> Producers and consumers of Application/Vnd.pwg-multiplexed 
> entities, as defined in [MIMEMPX], should consider each 
> component image message of the compound document as having 
> one and only one reference. The producer of the compound 
> document must assume that the consumer of the 
> Application/Vnd.pwg-multiplexed entity has limited memory and 
> therefore include a unique image message for each image 
> reference found in the root document. If a ContentID is 
> present in the header of an image message, that ContentID 
> must be unique. If a Content-Location is present in the 
> header of an image message, that Content-Location is required 
> to be unique except for the special case where a repeated 
> reference to the same image URL causes several messages 
> containing of the exact same image data to be present in the 
> compound document. Consumers may release the message data 
> associated with an image reference as the image is rendered, 
> because the Consumer can be confident that another reference 
> to the same image will be accompanied by another message 
> containing an copy of that same image data. Consumers may 
> also substitute image data for a message with a given 
> Content-Location header value with image data from other 
> messages with the same Content-Location header value because 
> Consumers can be confident that messages with identical 
> Content-Location values do in fact contain identical data.
> 
> I suggest a further clarification by adding a following paragraph.
> 
> URL references in the root document of the multiplexed 
> document must be matched to Content-Location and/or 
> Content-ID fields of the referenced message object according 
> to the rules given by RFC2557. An exception to the rules 
> given by RFC2557 occurs when a reference is made to a message 
> object named with a Content-Location. In that special case, 
> multiple instances of that message are required in the 
> compound document.
> 

I like this wording and if there are no objects I will amend the XHTML-Print
spec to contain this text.  I will wait before amending the document to give
participants a chance to comment.

Jim Bigelow, 
Editor: XHTML-Print & CSS Print Profile
IEEE-ISTO, Printer Working Group 
http://www.pwg.org/xhtml-print
Hewlett-Packard
208-396-2068
jim.bigelow at hp.com  




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