00281    a2200109   4500020001500000082001700015100001900032245003500051260004000086300002000126650002500146  a0133270998  a005.756bBRO  aBrock, Bert De  aFoundations semantic databases  aNew YorkbPrentice Hallc1995g1995  axiv,230p.c23cm  aRELATIONAL DATABASES