- From: PARAB,DEEPALI (HP-Boise,ex1) <deepali.parab@hp.com>
- Date: Thu, 8 Apr 2004 12:24:31 -0400
- To: "BIGELOW,JIM (HP-Boise,ex1)" <jim.bigelow@hp.com>, www-html-editor@w3.org, Elliott Bradshaw <Elliott.Bradshaw@Zoran.com>, don@lexmark.com
- Cc: xp@pwg.org
Hi Jim, My experience says that its should be, ================================== </body> </html> CHK 0 0 LAST ================================== The reason is, carriage return (ASCII code 0Dh), which positions the cursor to the left side of the current line of characters, line feed (ASCII code 0Ah), which moves the cursor down one line on the output device. So if the code is as follows =========================== A) </html><CR><LF>CHK 0 0 LAST then we should get OR </html><LF>CHK 0 0 LAST Then the output would be, </body> </html> CHK 0 0 LAST =========================== B) But if an additional <LF> (<0a>) is inserted like shown, </html><CR><LF><LF>CHK 0 0 LAST OR </html><LF><LF>CHK 0 0 LAST Then the output would be, </body> </html> CHK 0 0 LAST ========================== I have observed that PDF file formats (I have worked on then till 1.4 Version) also have this interpretation of CR/LF. Note that this was seen on windows environment. Regards, -Deepali -----Original Message----- From: owner-xp@pwg.org [mailto:owner-xp@pwg.org] On Behalf Of BIGELOW,JIM (HP-Boise,ex1) Sent: Thursday, April 08, 2004 9:52 AM To: www-html-editor@w3.org; Elliott Bradshaw; don@lexmark.com Cc: xp@pwg.org Subject: XP> xhtml-print: RFC3391 interpretation question: how much visual sep aration ends a chunk? I'm looking for opinions on the interpretation of RFC3391 [1] since it is normatively referenced by XHTML-Print [2]. RFC 3391 says, An Application/Vnd.pwg-multiplexed entity contains a sequence of chunks. Each chunk consists of a chunk header, a chunk payload and a CRLF. - The chunk header consists of a "CHK" keyword followed by the message number, the chunk payload length, whether the chunk is the last chunk of a message and, finally, a CRLF. The length field removes the need for boundary strings that Multipart uses. (See section 3.1 for the syntax of a chunk header). - The chunk payload is a sequence of octets that is either a complete message or a part of a message. - The CRLF provides visual separation from the following chunk. There are several situations where a single CRLF does not provide visual separation since the CRLF added to the document simply terminates a line rather than adding a empty line. For example in an XHTML-Print document didn't contain a terminating CRLF and adding a single CRLF would give the result shown below in example 1: </body> </html> CHK 0 0 LAST Rather than the following, example 2, I expected from reading the spec: </body> </html> CHK 0 0 LAST This could also occur when interleaving images and the root document. I think this issue will have a large impact on interoperability between printers and producers of multiplexed documents. So I'd like to get other people's interpretations of this matter. If I don't hear from anyone, I'll assume agreement that the multiplexed document should contain visual separation at the end of the chunk, as in the example 2. Jim [1] http://www.ietf.org/rfc/rfc3391.txt [2] http://www.w3.org/TR/xhtml-print/
Received on Thursday, 8 April 2004 12:25:35 UTC