At 12:15 -0600 on 12/26/2011, Paul Gilmartin wrote about Re:
Eight-character TSO Userid Support:
Likewise, in days of yore, but no longer, one DSN was not allowed
to be a prefix of another, such as:
GUBBINS.WOMBAT versus
GUBBINS.WOMBAT.FUBAR
This was due to CVOL Support. Each level was a set of chained records
and WOMBAT as a File name conflicted with it being a record
containing a pointer to another level. If you had
GUBBINS.WOMBAT.FUBAR and GUBBINS.WOMBAT.WOMBAT.FUBAR that was
allowed. The GUBBINS Index record would point to chained records
which were the 2nd level of indexes (one of which was WOMBAT). That
WOMBAT Index record would point to a 3rd level of indexes (all
chained from GUBBINS.WOMBAT). One FUBAR File record would be pointed
to by the WOMBAT File record that was pointed to by GUBBINS.WOMBAT
while another would be pointed to by GUBBINS.WOMBAT.
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