This file 
        /usr/proj3/case/95s523/meets_view.hlp
contains an explanation of how chgen 
builds a nontrivial version of meets_view foruse
by pr_load and pr_dump.  It requires NEW_VERSION
to NOT be defined in chgen's makefile (ver_8)

This is of interest to the bde.dat conversion projects
and to the olc juiceplant projects in 95s522.
which need  to constrain the view to economize on
log printing during simulation. E.g. perhaps 
only the EI que gets printed by the main loop.

 Subject: meets_view needs '#ifndef NEW_VERSION' when compiling chgen: 
 Date: Thu, 16 Mar 1995 02:34:26 -0500 (EST)
 Ref: /usr/proj3/case/95s523/meets_view.hlp
	and /usr/proj3/case/gen/ver_8/meets_view.hlp
 
 pr_load/pr_dump do not check if the table is in the view
 before doing I/O because meets_view, which they call, has this body:
 (from gen_pr_utils.c in case/gen/ver_8/src):
  
 #ifndef NEW_VERSION
         fprintf(prload_fp,
"  return(hcg_view_list.view_list[view_idx].version_list[tbl_idx] == (get_version(&pkey)))\n");
 #else
         fprintf(prload_fp,"  return(1);\n");
 #endif
 
 A nontrivial meets_view check requires NEW_VERSION to be 'undefined'.
 which only works at CHGEN COMPILE TIME. This should be done in the 
 application's Makefile.  This causes meets_view to invoke and return 

 	(hcg_view_list.view_list[view_idx].version_list[tbl_idx] 
 						== (get_version(&pkey)))
 instead of always returning 1. 
 
 It compares the current table row's version number (subfield of the pkey)
 to the desired version number for this table 
 (selected by tbl_idx) and the view (selected by view_idx).
 
-------------------------------------------------------------
 How NEW_VERSION constrains the table types to be loaded/dumped:

 (We don't have any pr_ routines with NEW_VERSION undefined  
  so we have to look at the fprint statements in the gen_pr*routines.)

 NEW_VERSION is used in several places:
 
 tern(185)> pwd
 /nfs/jupiter/proj3/case/gen/ver_8/src
 tern(186)> grep NEW_VERSION *.c
 gen_load_data.c:69:#ifndef NEW_VERSION
 gen_pr_add.c:104:#ifndef NEW_VERSION
 gen_pr_dump.c:102:#ifndef NEW_VERSION
 gen_pr_utils.c:156:#ifndef NEW_VERSION
 gen_pr_utils.c:256:#ifndef NEW_VERSION
 

 E.g., in gen_pr_dump.c, these checks are made for each internal table type:
 
 #ifndef NEW_VERSION
         fprintf(prdump_fp,"\tif ((hcg_view_list.view_list[hcg_view_idx].version_list[hcg_tbl_idx] != '\\0') &&\n");
         fprintf(prdump_fp,"\t  (hcg_ts_list[hcg_tbl_idx].ts_list[hcg_view_list
.view_list[hcg_view_idx].version_list[hcg_tbl_idx]].rcount > 0))\n");
 #else
         fprintf(prdump_fp,"\tif (hcg_ts_list[hcg_tbl_idx].ts_list[hcg_view_list.view_list[hcg_view_idx].version_list[hcg_tbl_idx]].rcount > 0)\n");
 #endif
 
 so the added condition #ifndef NEW_VERSION is:
 
 if ((hcg_view_list.view_list[hcg_view_idx].version_list[hcg_tbl_idx] != '\\0') 
 
 A table not in the view will be excluded by a \0 entry in 
 the inner array version_list[hcg_tbl_idx]. This array is initialized 
 when the  view definition file is scanned by pr_init.c.
 

In bde/schema/pr_load.c, pr_init first zeroes this array (line 1698+ below)
and then changes it if the table type appears with a legitimate 
version number in some view_element of the named view in the .vdf file:
---------------------------------------------
for (i=0; i<100; i++)
    hcg_view_list.view_list[hcg_view_list.num_views].version_list[i] = '\0';

After parsing out table_abbrev, if find_tbl_idx(table_abbrev) succeeds,
hcg_version is defined from the view_elelement field , checked against limits,
and entered into the hcg data structures:

if (hcg_version > 0)
              hcg_view_list.view_list[hcg_view_idx].version_list[hcg_tbl_idx] = (char) hcg_version;
else
              hcg_view_list.view_list[hcg_view_idx].version_list[hcg_tbl_idx] = (char) hcg_table_seq_list[hcg_tbl_idx].maxver+hcg_version;
-----------------------------------------------
Therefore it appears that a legitimate table in the view gets a legal version
number assigned in the nested array version_list[hcg_tbl_idx] above, 
otherwise the table keeps its initial zero value.