Data items in the DATABASE_PDB_REV_RECORD category record
               details about specific record types that were changed in a
               given revision of a PDB entry.
               These data items are assigned by the PDB database managers and
               should only appear in a data block if they originate from that
               source.
 
    loop_
    _database_PDB_rev_record.rev_num
    _database_PDB_rev_record.type
    _database_PDB_rev_record.details
      1  CONECT
    ; Error fix - incorrect connection between
      atoms 2312 and 2317
    ;
      2  MATRIX  'For consistency with 1995-08-04 style-guide'
      3  ORIGX   'Based on new data from author'