Note: it is recommended that the order of the receive-control-file
   subcommand and the receive-data-file sub-command be configurable
   because either order fails for some print systems. Some print systems
   assume that the control file follows all data files and start
   printing immediately on receipt of the control file. When such a
   print system tries to print a data file that has not arrived, it
   produces an error.  Other print systems assume that the control file
   arrives before the data files and start printing when the first data
   file arrives. Such a system ignores the control information, such as
   banner page or copies.

   NOTE: This specification does not define the mapping between the IPP
   printer-uri and the LPD printer-name.

   The mapper SHALL send the IPP operation attributes and job template
   attributes received from the operation to the LPD printer by using
   the LPD receive-control-file sub-command. The mapper SHALL create the
   LPD job-number for use in the control file name, but the receiving
   printer MAY, in some circumstances, assign a different job-number to
   the job.  The mapper SHALL create the IPP job-id and IPP job-uri
   returned in the Print-Job response.

   NOTE: This specification does not specify how the mapper determines
   the LPD job-number, the IPP job-id or the IPP job-uri of a job that
   it creates nor does it specify the relationship between the IPP job-
   uri, IPP the job-id and the LPD job-number, both of which the mapper
   creates.  However, it is likely that the mapper will use the same
   integer value for both the LPD job-number and the IPP job-id, and
   that the IPP Job-uri is the printer's URI with the job-id
   concatenated on the end.

   The mapper SHALL send data received in the IPP operation to the LPD
   printer by using the LPD receive-data-file sub-command. The mapper
   SHALL specify the exact number of bytes being transmitted in the
   number-of-bytes field of the receive-data-file sub-command. It SHALL
   NOT use a value of 0 in this field.

   If the mapper, while it is transmitting a receive-a-printer-job
   command or sub-command, either detects that its IPP connection has
   closed or receives a Cancel-Job operation, the mapper SHALL terminate
   the LPD job either with the abort sub-command or the remove-jobs
   command.

   This document does not address error code conversion.








 
RFC 2569         Mapping between LPD and IPP Protocols        April 1999


5.2 Print-URI

   The mapper SHALL handle this operation in the same way as a Print-Job
   operation except that it SHALL obtain data referenced by the
   "document-uri" operation attribute and SHALL then treat that data as
   if it had been received via a Print-Job operation.

5.3 Validate-Job

   The mapper SHALL perform this operation directly. Because LPD
   supports very few attributes, this operation doesn't have much to
   check.

5.4 Create-Job

   The mapper SHALL handle this operation like Print-Job, except:

      - the mapper SHALL send the control file after it has received the
        last Send-Document or Send-URI operation because the control
        file contains all the document-name and document-format values
        specified in the Send-Document and Send-URI operations.
      - the mapper SHALL perform one receive-data-file sub-command for
        each Send-Document or Send-URI operation received and in the
        same order received.
      - the mapper SHALL send the control file either before all data
        files or after all data files. (See the note in the section on
        Print-Job about the dilemma of sending the control file either
        before or after the data files.

5.5 Send-Document

   The mapper performs a receive-data-file sub-command on the received
   data. See the preceding section 5.4 "Create-Job" for the details.

5.6 Send-URI

   The mapper SHALL obtain the data referenced by the "document-uri"
   operation attribute, and SHALL then treat that data as if it had been
   received via a Send-Document operation. See the preceding section 5.5
   "Send-Document" for the details.

5.7 Cancel-Job