IPP> RE: SLP - Summary of next 'printer:' template proposal

IPP> RE: SLP - Summary of next 'printer:' template proposal

IPP> RE: SLP - Summary of next 'printer:' template proposal

Mikael Pahmp mikael.pahmp at axis.com
Thu Jan 14 08:35:31 EST 1999


It is not mentioned in your mail if the 'printer:' template will
include conrete service schemes as before or if it should only
describe the abstract part and have separate documents for the
concrete schemes. I suggest having the conrete schemes included
for both IPP, LPR, NDPS and Raw TCP as long as they don't add too
many attributes to those that are common.

I've heard that Microsoft has a way of describing LPR printers
that discerns how different print servers implement LPR. This
information should probably be included as attributes for LPR
printers. Does anyone know what this information consists of?
I will also try to find it myself.

In a previous mail, someone noted that the Raw TCP printer
template doesn't contain a syntax description for the conrete URI.
It does. The 'url-path' is empty as it doesn't make sense to have
a path part when addressing a raw tcp port.

In the Raw TCP template, a new attribute 'device-id' is included
apart from the common ones. The data for this attribute is often
available from a paralell port printer (if it supports the IEEE
1284 standard) and can easily be included in the SLP service by a
'print server'. The Device ID is used by Windows 95/98 Plug & Play
to automatically select the correct printer driver. I suggest that
this attribute is added to the list of attributes of the abstract
printer service as an optional attribute instead as it is useful
in all print protocols when determining print driver.

/Mikael

> -----Original Message-----
> From: Ira McDonald [mailto:imcdonal at sdsp.mc.xerox.com]
> Sent: den 14 januari 1999 02:45
> To: ipp at pwg.org; srvloc at srvloc.org
> Subject: SLP - Summary of next 'printer:' template proposal
> 
> 
> 
> Hi folks,                                    Wednesday (13 
> January 1999)
> 
> This note seeks concensus before a next revision of the SLPv2 
> 'printer:'
> template.  PLEASE send your opinion to the IPP mailing list.  
> Also, the
> SLPv2 'printer:' template will be discussed at the PWG monthly
meeting
> next week in Maui, Hawaii - but I won't be there - sigh...
> 
> Our concensus at today's IPP WG Telecon was:
> a)  Use the SLPv2 'printer:' template as the master for 
> writing coherent
>     SLPv1-compatible concrete templates for each print protocol;
> b)  REDUCE attributes in the SLPv2 'printer:' template from 
> mandatory to
>     optional, whenever reasonable;
> c)  Let the IPP Model raise the conformance level for certain
optional
>     attributes (but only for IPP supporting printers);
> d)  Specify a default value of 'unknown' or '-1' (STRING or
INTEGER)
>     for each optional attribute (so that an SLP User Agent can
tell if
>     the registration includes meaningful information, even in
SLPv1);
> d)  DELETE 'print-quality-supported' from the SLPv2 
> 'printer:' template,
>     because it is too subjective to be useful (unlike nominal
speed);
> e)  ADD a new second printer speed attribute
'pages-per-minute-color'
>     (also to be added to IPP/1.0 as a registered extension).
> 
> Per my action item from today's IPP WG Telecon, here is a 
> summary of all
> attributes planned for a next revision of the SLPv2 
> 'printer:' template,
> with their SLP syntax (and flags), SLP status (mandatory or
optional),
> and IPP status for directory registrations (NOT for IPP 
> Printer objects)
> - per Appendix E 'Generic Directory Schema' of IPP Model and
Semantics
> (16 November 1998).
> 
> The next SLPv2 'printer:' template (summarized here) would have
(28)
> attributes, including (6) mandatory ones and (22) optional 
> ones.  After
> the summary table, a rationale is presented for EACH mandatory
or
> optional attribute.
>         
> Cheers,
> - Ira McDonald (outside consultant at Xerox)
>   High North Inc
>   716-461-5667 (w/ voice mail)
> 
> PS - Harry Lewis posted my last update to the SLPv2 
> 'printer:' template
> today in the directory 
> 'ftp://ftp.pwg.org/pub/pwg/ipp/new_SLP'.  Sorry I
> failed to post this revised template before, except on the 
> mailing list.
> 
> --------------------------------------------------------------
> ----------
> 
> SLP Flags
> ---------
> L    Literal (NOT to be translated)
> M    Multi-valued (comma separated in template)
> O    Optional (not mandatory in template)
> 
> SLPv2 'printer:' Attribute         SLP Syntax    SLP Status  
> IPP Status
> Name (usually IPP Name)            and Flags     (Directory) 
> (Directory)
> --------------------------         ----------    ----------- 
> -----------
> printer-uri-supported <1>          STRING L      Mandatory   
> Recommended
> uri-security-supported <2>         STRING L      Mandatory   
> Recommended
> printer-name <3>                   STRING        Mandatory   
> Recommended
> printer-location (1)               STRING O      Optional    
> Recommended
> printer-info (2)                   STRING O      Optional
Optional
> printer-more-info (2)              STRING L O    Optional
Optional
> printer-make-and-model (2)         STRING O      Optional    
> Recommended
> printer-current-operator (1)       STRING O      Optional    
> (PrintMIB)
> printer-service-person (1)         STRING O      Optional    
> (PrintMIB)
> natural-language-configured <4>    STRING L      Mandatory   
> (no status)
> natural-language-supported <5>     STRING L M    Mandatory
Optional
> charset-configured (3)             STRING L O    Optional    
> (no status)
> charset-supported (3)              STRING L M O  Optional
Optional
> document-format-supported <6>      STRING L M    Mandatory   
> Recommended
> color-supported (2)                STRING L O    Optional    
> Recommended
> finishings-supported (2)           STRING L M O  Optional
Optional
> number-up-supported (2)            INTEGER M O   Optional
Optional
> sides-supported (2)                STRING L M O  Optional    
> Recommended
> media-supported (2)                STRING L M O  Optional    
> Recommended
> media-local-supported (2)          STRING M O    Optional    
> (see above)
> printer-resolution-supported (2)   STRING L M O  Optional
Optional
> [print-quality-supported] (4)      STRING L M O  Optional
Optional
> copies-supported (2)               INTEGER O     Optional    
> (no status)
> job-k-octets-supported (2)         INTEGER O     Optional    
> (no status)
> pages-per-minute (2)               INTEGER O     Optional    
> (new in IPP
> pages-per-minute-color (2)         INTEGER O     Optional    
> (new in IPP
> delivery-orientation-supported (2) STRING L O    Optional    
> (PrintMIB)
> priority-levels-supported (2)      INTEGER O     Optional    
> (Salutation
> paper-output (2)                   STRING L M O  Optional    
> (Salutation
> 
> Mandatory attribute rationales
> ------------------------------
> <1> printer-uri-supported       supports single registration
object
>                                 - all print protocol paths 
> (per IPP/1.0)
> 
> <2> uri-security-supported      supports direct use of each 
> printer URI
>                                 - required security (per RFC
2316)
> 
> <3> printer-name                supports user-friendly access 
> to printer
>                                 - natural language name (per
IPP/1.0)
> 
> <4> natural-language-configured supports direct use of each 
> printer URI
>                                 - configured language (per RFC
2277)
> 
> <5> natural-language-supported  supports direct use of each 
> printer URI
>                                 - supported languages (per RFC
2277)
> 
> <6> document-format-supported   supports direct use of each 
> printer URI
>                                 - supported PDLs (per IPP/1.0)
> 
> Optional attribute rationales
> -----------------------------
> (1) Often not configured by system administrators (per Hugo
Parra)
> (2) Often unknown to print servers (per Hugo Parra)
> (3) ALL Internet application protocols MUST support UTF-8 
> (per RFC 2277)
> (4) Propose to DELETE in next SLPv2 'printer:' template (per 
> Hugo Parra)
> 



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