/*   BEGIN INCLUDE  vrm_rel_desc.incl.pl1		   */

/* 83-05-26 Roger Lackey : Added vrm_attr_info.key_head bit for relation_cursors */

dcl 1 vrm_rel_desc based (vrm_rel_desc_ptr),
    2 record_id bit (12) unal,			/* Distinguish us from tuples and collection records */
    2 version char (8),				/* Version of this structure */
    2 file_id bit (7),				/* Value of file id from model */
    2 rel_id bit (12),				/* Relation id */
    2 switches,
      3 MRDS_compatible bit (1) unal,			/* For pre-relation_manager_ MRDS */
      3 stationary_records
     bit (1) unal,					/* On = stationary */
      3 indexed bit (1) unal,				/* This relation has attributes with secondary indices */
      3 pad bit (33) unal,
    2 var_offset fixed bin (35),			/* Position of first varying attr */
    2 maximum_data_length
     fixed bin (35),				/* Maximum size of tuple in characters */
    2 number_primary_key_attrs
     fixed bin,					/* Number of attributes which make up the primary key */
    2 number_sec_indexes fixed bin,			/* Number of attributes which have a secondary index */
    2 last_var_attr_no fixed bin,			/* Attr index of last varying attribute */
    2 number_var_attrs fixed bin,			/* Number of varying attributes */
    2 number_attrs fixed bin,				/* Number of attribute in rel */
    2 attr (vrd_no_of_attrs				/* Description of each attribute */
     refer (vrm_rel_desc.number_attrs)) aligned like vrm_attr_info;

dcl 1 vrm_attr_info based (vrm_attr_info_ptr),
						/* Attribute specific info */
    2 name char (32),				/* Name of the attribute */
    2 descriptor bit (36) aligned,			/* domain descriptor */
    2 varying bit (1) unal,				/* ON = This is a varying string */
    2 key_head bit (1) unal,				/* ON = This attr can be a keyhead */
    2 primary_key_attr bit (1) unal,			/* ON = This is a primary key attribute */
    2 pad bit (15) unal,				/* unused */
    2 index_collextion_ix fixed bin (17) unal,		/* Index into vrm_open_info.index_collection array if key_head is on */
    2 bit_length fixed bin (35),			/* Maximum bit length of tuple */
    2 bit_offset fixed bin (35);			/* Offset in tuple if fixed, index to offset in tuple if varying */


dcl  vrm_rel_desc_ptr pointer;
dcl  vrd_no_of_attrs fixed bin;
dcl  VRM_REL_DESC_RECORD_ID bit (12) unal int static options (constant) init ("100000000000"b);
dcl  VRM_REL_DESC_VERSION_1 char (8) int static options (constant) init ("       1");
dcl  vrm_attr_info_ptr pointer;
dcl  VRM_REL_DESC_KEY char (256) varying int static options (constant) init ("@relation_description");

/*   END INCLUDE  vrm_rel_desc.incl.pl1		   */


*/
                                          -----------------------------------------------------------


Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group Bull including Bull HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell Bull Inc., Groupe Bull
and Bull HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture for 
managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

                                          -----------------------------------------------------------

Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, Bull or Bull HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by Bull HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved

*/