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Versions: 01 02 03 04 05 06                                             
Service Location Working Group                          Pete St.  Pierre
INTERNET DRAFT                                     Sun Microsystems, Inc
                                                          Scott Isaccson
                                                             Novell, Inc
                                                           14 March 1998

       Definition of printer:  URLs for use with Service Location

Status of This Memo

   This document is a submission by the Service Location Working Group
   of the Internet Engineering Task Force (IETF).  Comments should be
   submitted to the srvloc@corp.home.net mailing list.

   Distribution of this memo is unlimited.

   This document is an Internet-Draft.  Internet-Drafts are working
   documents of the Internet Engineering Task Force (IETF), its areas,
   and its working groups.  Note that other groups may also distribute
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   Distribution of this memo is unlimited.


   This document defines the printer service type and the attributes
   associated with it.  This template is designed to be used in
   conjuction with the Service Location Protocol [1], but may be
   used with any directory service supporting attribute/value pair

   The printer service type is designed as an abstract service type.  It
   is expected that printers advertised with the printer type may be
   accessible by one or more protocols.  IPP and lpr are a two examples

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   of printing protocols that may be used to perform the actual printing

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Status of This Memo                                                    i

Abstract                                                               i

 1. Printer service: URL Scheme                                        1

 2. urlpath Definition                                                 1
     2.1. IPP . . . . . . . . . . . . . . . . . . . . . . . . . . .    1
     2.2. lpr . . . . . . . . . . . . . . . . . . . . . . . . . . .    2

 3. Printer Scheme Background                                          2

 4. Printer Service Template                                           3

 5. Summary of Required Attributes                                     7

 6. Acknowledgments                                                    7

 A. Attribute Origins                                                  8

 B. References                                                         8

1. Printer service: URL Scheme

   Service Type templates are used to describe in a standard way those
   services which use the service: URL. The template described in this
   document is an abstract type that includes concrete types such as
   the printing protocol defined in RFC 1179 [2], "Line Printer Daemon
   Protocol".  The service type for this service: URL is printer.

2. urlpath Definition

   The printer type is an abstract service type.  Because an abstract
   service type may contain one of many concrete types, the urlpath
   associated with a printer URL may vary.  Two types of printers that
   are expected to be common in printer URLs are ipp and lpr.

2.1. IPP

   An IPP printer MAY support 'http', 'https', 'mailto', or other
   underlying transport protocols.  The definition of an IPP Printer

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   object is specified in section 2.1 'Printer Object' of the IPP/1.0
   Model and Semantics draft [3].  Examples of valid Service URLs for
   IPP printers include:


2.2. lpr

   An lpr accessible printer includes a queue name as the last part of
   the URL. If a queue name is absent, the print server is assumed to
   use a default print queue.


3. Printer Scheme Background

   The printer scheme provides for consistent registration of printer
   services.  The attributes described within this draft are a
   combination of previous works conducted by the IETF Printer MIB WG,
   the IETF IPP WG and the Salutation Consortium.

   The attributes specified are intended to facilitate both automatic
   as well as manual selection of services not to provide service
   statistics or notification.  In short, the target audience of service
   attributes are users, either programatic or end users, whereas the
   audience of MIB statistics are network managers.

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4. Printer Service Template

   The printer template, as defined below, conforms to the grammar
   described in "Service Templates and service:  Schemes".  Please refer
   to [4] for detailed explaination of the syntax.

-------------------- template begins here --------------------
        type = printer

        version = 0.1

        language = en

        description =
            The printer service template describes the attributes
            supported by network printing devices.  Devices may be
            either directly connected to a network, or connected to a
            printer spooler that understands the a network queuing
            protocol such as IPP, lpr or the Salutation Architecture.

        url-syntax =
            url-path    = ippurl / lprurl
            ippurl      = url as defined in [3]
            lprurl      = "lpr://" hostport [ "/" qname ]
            hostport    = host [ ":" port ]
            host        = hostname / hostnumber
            hostname    = *( domainlavel "." ) toplabel
            domainlabel = alphanum /
                          alphanum * [alphanum / "-"] alphanum
            toplabel    = alpha / alpha * [alphanum / "-"] alphanum
            hostnumber  = ipv4-number / ipv6-number
            ipv4-number = 1*3digit 3*3("." 1*3digit)
            ipv6-number = 32*hex
            3digit      = digit digit digit
            port        = 1*digit
            alphanum    = alpha / digit
            alpha       = "a" / "b" / "c" / "d" / "e" / "f" / "g" /
                          "h" / "i" / "j" / "k" / "l" / "m" / "n" /
                          "o" / "p" / "q" / "r" / "s" / "t" / "u" /
                          "v" / "w" / "x" / "y" / "z" /
                          "A" / "B" / "C" / "D" / "E" / "F" / "G" /
                          "H" / "I" / "J" / "K" / "L" / "M" / "N" /
                          "O" / "P" / "Q" / "R" / "S" / "T" / "U" /
                          "V" / "W" / "X" / "Y" / "Z"
            digit       = "0" / "1" / "2" / "3" / "4" / "5" / "6" /
                          "7" / "8" / "9"

        name = STRING
            # This attribute contains the name of the printer.

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            # An administrator determines a printer's name and sets this
            # attribute to that name.  This name may be the last part of
            # the printer's URI or it may be unrelated.  In
            # non-US-English locales, a name may contain characters
            # that are not allowed in a URI.

        description = STRING
            # A free form string that can contain any site-specific
            # descriptive information about this printer.

        printer-info = STRING L O
            # A URI used to obtain more information about
            # this specific printer.  For example, this could
            # be an HTTP type URI referencing an HTML page accessible
            # to a Web Browser.  The information obtained from this
            # URI is intended for end user consumption.  Features
            # outside the scope of IPP can be accessed from this URI.

        uri-security-supported = STRING L
            # The types of security that is supported for this uri.
            # TLS is one example.  URIs that do not support a security
            # mechanism should specify 'none'.
            none, tls, ssl3

        concrete-protocols = STRING L M
            # The names of the concrete protocol types supported
            # by the printer abstract service type.  Example values
            # include http and lpr

        abstract-protocol = STRING L O
            # The name of the abstract protocol which may be run over
            # any concrete types listed.  For example, the abstract
            # protocol 'ipp' may be run over the concrete types of http
            # or 'mailto'

        make-model = STRING O
            # A simple text string defined by the manufacturer
            # It should provide the name of the vendor and the model
            # name or number

        location = STRING O
            # A free form description of this printer's physical
            # location For example:  "2nd floor, near the fire escape"

        operator = STRING M O
            # A person, or persons responsible for maintaining a
            # printer on a day-to-day basis.

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        natural-language-supported = STRING L M
            # The languages in which error and status messages
            # may be delivered in.  Legal values come from RFC 1766
            # "Tags for the Identification of Languages"[5]

        charset-supported = STRING L M
            # The character sets supported by this printer, for example
            # UTF-8, Shift-JIS or ISO-Latin-1.  Legal values come from
            # the IANA Registry of Coded Character Sets.  [6]

        duplex-mode = STRING L M O
            # The duplex capabilities a printer can handle.
            simplex, duplex, tumble, one-sided, two-sided-long-edge,

        priority-levels-supported = INTEGER O
            # The number of priority levels supported by this printer.
            # a value of 1 indicates all jobs have the same priority.

        number-up = INTEGER O
            # Specifies the number of source page-images to impose
            # upon a single side of an instance of a selected
            # medium.

        media-supported = STRING L M O
            # The names or sizes of the media supported by this printer
            # This value is based on the legal values defined in ISO
            # 10175

        media-local-supported = STRING M O
            # The site-specific names, types, and/or sizes of the
            # media supported by this printer.  The values specified
            # are localized according to the value of
            # 'natural-language-configured'.  For example
            # 'purchasing-form' as opposed to 'na-letter'.

        color-supported = BOOLEAN O
            # Indicates whether color is supported

        document-format = STRING L M O
            # The format of the data to be printed.  The standard
            # values for this attribute are Internet Media types
            # which are sometimes called MIME types.

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        paper-output = STRING L M O
            # The mode in which pages output are arranged.
            standard, noncollated sort, collated sort, stack, unknown

        print-quality = STRING L O
            # Subjective evaluation of the overall printing quality.
            draft, normal, high

        resolution = STRING L M O
            # A string reprentation of 3 comma (",") separated integers
            # where each integer itself is represented as a string.
            # The 3 integers represent in order:  1) a cross feed
            # direction resolution (positive integer value), 2) a feed
            # direction resolution (positive integer value), and 3)
            # a units value.  In the latter case, a '3' indicates
            # dots per inch and a '4' indicates dots per centimeter.
            # These values are derived from the Printer MIB [6].

        copy-count = INTEGER O
            # The maximum number of copies of a document
            # that will be printed as a single job.  A value of -1
            # indicates there is no limit.

        job-k-octet-supported = INTEGER O
            # The maximum size, in Kilobytes, of a print job that
            # the print queue will accept." A value of -1 indicates
            # there is no limit.

        finishing = STRING M O
            # Identifies the finishing operationssupported by the
            # printer.    none, staple, staple-top-left, staple-bottom-left,
            staple-top-right, staple-bottom-right, saddle-stitch,
            edge-stitch, punch, bind, cover

        delivery-orientation = STRING O
            # Orientation of pages as the are printed and ejected from
            # the printer.
            unknown, face up, face down

        service-person = STRING O M
            # A list of service contact names for this printer.

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-------------------- template ends here ----------------------

5. Summary of Required Attributes

   The purpose of having attributes associated with a service URL is
   to provide a dynamic search capability to service location clients.
   It is not intended to burden server implementations with additional
   information to provide in a registration.  For this reason, the only
   a subset of the attributes included in this template are required in
   compliant implemenations.

            Mandatory                      Optional

        name                         printer-info
        description                  abstract-protocol
        uri-security-supported       make-model
        concrete-protocols           location
        natural-language-supported   operator
        charset-supported            duplex-mode

6. Acknowledgments

   This document is a product of the Service Location Working group.

   Thanks go out to Ira McDonald and Jean Beah at Xerox, Jim Erwin
   and Todd Rupper of Novell and Randy Turner of Sharp Labs.  The IPP
   working group's efforts on a directory schema have been instrumental
   in making this template happen.

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A. Attribute Origins

   The following table summarizes the attributes included in the printer
   scheme and their origins.  This table does not include attributes
   required in the "Service Templates and URLs" Draft.  It also includes
   attributes that may not have a specific origin, but were deemed
   useful in locating a printer service.

       Attribute        Printer MIB[6]    IPP[3]        Salutation[7]
   name                                      X
   description                               X
   printer-info                              X
   uri-security-supported                    X
   make-model                                X
   location                                  X
   operator                  X
   natural-language-supported                X
   charset-supported                         X
   duplex-mode                               X             X
   priority-levels-supported X                             X
   number-up                                 X
   media-supported                           X             X
   media-local-supported                     X
   color-supported                           X
   document-format                           X             X
   paper-output                                            X
   print-quality                             X
   resolution                X               X
   copy-count                                X             X
   job-k-octet-supported     X               X
   finishing                                 X
   delivery-orientation      X                             X
   service-person            X

B. References

    [1]J. Veizades, E. Guttman, C. Perkins, and S. Kaplan.  "Service
    Location Protocol", RFC 2165.  June 1997.

    [2]L. McLaughlin III, "Line Printer Daemon Protocol",
    RFC 1179.  August 1990.

    [3]R. deBry, T. Hastings, R. Herriot, S. Isaacson,
    P. Powell, "IPP/1.0:  Model and Semantics", Work

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    in progress, January 1998.

    [4]E. Guttman, C. Perkins, J. Kempf, "Service Templates and service:
    Schemes", Work in Progress, March, 1998

    [5]H. Alvestrand, "Tags for the Identification of Languages",
    RFC 1766.  March 1995.

    [6]IANA Registry of Coded Character Sets:

    [7]R. Smith, F. Wright, T. Hastings, S. Zilles, J. Gyllenskog,
    "Printer MIB", RFC 1759.  03/28/1995.

    [8]Salutation Consortium, Inc., "Salutation Architecture
    Specification V2.0", December 1996.

Full Copyright Statement

   Copyright (C) The Internet Society (1997).  All Rights Reserved.

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   The limited permissions granted above are perpetual and will not be
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   This document and the information contained herein is provided on an

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Authors' Addresses

   Questions about this memo can be directed to:

   Pete St. Pierre
   Sun Microsystems
   901 San Antonio Avenue
   Palo Alto, CA 94043
   Phone: +1 650 786-5790
   email: Pete.StPierre@Eng.Sun.COM

   Scott Isaccson
   Novell, Inc
   122 E 1700 S
   Provo, UT 84606
   Phone: 801-861-7366
   Fax:   801-861-2517
   e-mail: sisaacson@novell.com

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