IPP> April 3rd Meeting Minutes

IPP> April 3rd Meeting Minutes

IPP> April 3rd Meeting Minutes

Don Wright don at lexmark.com
Fri Apr 4 12:10:12 EST 1997


Attached are the meeting minutes for the April 3rd meeting
of the IPP Working Group in Austin.  In addition, I have
uploaded the .TXT and .PDF version on the ftp server as


ftp://ftp.pwg.org/pub/pwg/ipp/minutes/ipp-0497.txt
ftp://ftp.pwg.org/pub/pwg/ipp/minutes/ipp-0497.pdf


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Internet Printing Project Meeting Minutes
April 3, 1997
Austin, Texas




The meeting started on April 3rd, 1997 at 8:40AM led by Carl-Uno Manro.  The 
attendees were:


Ron Bergman - Data Products
Lee Farrell - Canon
Don Wright - Lexmark
Scott Isaacson - Novell
Jeff Copeland - QMS
Bob Pentecost - HP
Dave Kuntz - HP
Tom Hastings - Xerox
Harry Lewis - IBM
Roger Debry - IBM
William Wagner - Digital Products
Robert Herriot - Sun
Carl-Uno Manros - Xerox
Keith Carter - IBM
Jim Walker - Dazel
Chuck Adams - Tektronix
Stuart Rowley - Kyocera
Peter Zehler - Xerox
David McMaster - TrueSpectra
Jeff Barnett - IBM
Jerry Hadsell - IBM
Steve Adobe - Adobe
Randy Turner - Sharp
Paul Moore - Microsoft
Rob Rhoads - Intel




The following proposed agenda was reviewed and approved:


1)  Protocol
2)  Security
3)  Model
4)  Prototyping
5)  Directory
6)  Internationalization




PROTOCOL
 
Randy Turner presented his proposal "HTTP 1.1 as a Transport for the Internet 
Printing 
Protocol which is available as <draft-turner-ipp-trans-develop-00.txt> on the 
PWG server 
and is also an IETF internet draft.


Issues and comments:
1.  Should we suggest a specific URL format as the default for printers 
(www.printers.company.com or www.company.com/printers or something else)?
2.  Discussion again on "Why HTTP" - no resolution
3.  Why would we want to map IPP to different transports?  How would different 
implementations mapped to different transports ever interoperate?
4.  Is HTTP a "stop-gap" solution?  If so, when should we start talking about a 
longer 
term solution?
5.  Some of Randy's proposals would require some changes to the Model document.
6.  Implementation of Randy's proposal by Sharp preceded the development of the 
IPP 
Model document.
7.  Under Randy's proposal, he recommends that if HTML pages are created for 
non-IPP 
clients (like an existing browser) that we standardize the type of controls, 
etc. are 
present on the HTML pages.
8.  Discussion on whether an IPP over HTTP implementation should create HTML 
pages 
(presenting status and capabilities) that turn off caching of that page.
9.  Randy's proposal for an IPP server requires only a subset of the full 
HTTP/1.1 RFC.


Steve Zilles presented a proposal of an architecture for the IPP protocol.  
This was an 
interactive session where Steve presented his thoughts in a block diagram 
form.  As of the 
meeting, this proposal has not yet been documented in a paper.


Steve presented an issues list related to protocol:
1.  Coded format - content type header
* form data
* IPP unique
2.  Transport
* HTTP
* HTTP Subset
* Something else
3.  Where encoding operations happen:
* Host
* other
4.  One Message or Multiple Messages
* Single POST
* CREATE, SEND
5.  Printer status during sending
6.  Response to create
* Job data URL
* Query URL
* Modify URL
7.  Conformance requirements of >1 of protocol
8.  Alignment between Model and Protocol documents
9.  Use of accept headers to select
* language
* character set
* encoding
10.  No discussion of firewalls
11.  What to say in Memphis?


A major discussion occurred focused on having two protocol mappings: one that 
is 
browser-based (HTTP/HTML) and one that is a richer, peer-to-peer printing 
solution to 
replace LPD.  How do we provide interoperability?  Should we define 
interoperability?  
Are we solving two problems?  There was no consensus on this issue, further 
discussion 
will be on the mailing list. Steve Zilles will report this lack on consensus at 
the IETF 
meeting in Memphis.


Protocol Work Items and Owners:


Document a transport protocol and provide information as to why that is a good 
choice 
* HTTP 1.1 (Steve Zilles, Roger Debry)
* HTTP Subset (Randy Turner)
* IPP (Paul Moore)



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