public static void dbRelationGoesUnknown(Proposition proposition) {
    { edu.isi.sdbc.Connection connection = RDBMS.getConnectionFromPredicate(Proposition.getPropositionBaseOperator(proposition));

      edu.isi.sdbc.Connection.executeSql(connection, StringWrapper.wrapString(RDBMS.createSqlAssertionFromProposition(proposition, RDBMS.KWD_RETRACT)), Stella.NIL);
    }
  }