intended to work on "text" only formats and are inappropriate for
   many contemporary document formats that completely specify each page.
   This document does not address the support of these obsolete
   features.

   In the area of document formats, also known as page description
   languages (PDL), RFC 1179 defines a fixed set with no capability for
   extension.  Consequently, some new PDL's are not supported, and some
   of those that are supported are sufficiently unimportant now that
   they have not been registered for use with the Printer MIB [RFC1759]
   and IPP [RFC2566] [RFC2565], though they could be registered if
   desired.  See the Printer MIB specification [RFC1759] and/or the IPP
   Model specification [RFC2566] for instructions for registration of
   document-formats with IANA.  IANA lists the registered document-
   formats as "printer languages".

   This document addresses the protocol mapping for both directions:
   mapping of the LPD protocol to the IPP protocol and mapping of the
   IPP protocol to the LPD protocol. The former is called the "LPD-to-
   IPP mapper" and the latter is called the "IPP-to-LPD mapper".






 
RFC 2569         Mapping between LPD and IPP Protocols        April 1999


   This document is an informational document that is not on the
   standards track.  It is intended to help implementers of gateways
   between IPP and LPD.  It also provides an example, which gives
   additional insight into IPP.

2. Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

   RFC 1179 uses the word "command" in two contexts: for over-the-wire
   operations and for command file functions. This document SHALL use
   the word "command" for the former and the phrase "functions" for the
   latter.  The syntax of the LPD commands is given using ABNF
   [RFC2234].

   The following tokens are used in order to make the syntax more
   readable:

      LF stands for %x0A (linefeed)
      SP stands for %x20.  (space)
      DIGIT stands for %x30-39 ("0" to "9")

3. Mapping from LPD Commands to IPP Operations

   This section describes the mapping from LPD commands to IPP
   operations.  Each of the following sub-sections appear as sub-
   sections of section 5 of RFC 1179.

   The following table summarizes the IPP operation that the mapper uses
   when it receives an LPD command. Each section below gives more
   detail:

      LPD command                IPP operation


      print-any-waiting-jobs     ignore
      receive-a-printer-job      Print-Job or Create-Job/Send-Document
            send queue state       Get-Printer-Attributes and Get-Jobs
              (short or long)
            remove-jobs          Cancel-Job










 
RFC 2569         Mapping between LPD and IPP Protocols        April 1999


3.1 Print any waiting jobs

   Command syntax:

     print-waiting-jobs = %x01 printer-name LF

   This command causes the LPD daemon check its queue and print any
   waiting jobs. An IPP printer handles waiting jobs without such a
   nudge.

   If the  mapper receives this LPD command, it SHALL ignore it and send
   no IPP operation.

3.2 Receive a printer job