public void initializeBusDescriptor() {
    MWTableDescriptor descriptor = getBusDescriptor();
    MWTable table = tableNamed("BUS");
    descriptor.setPrimaryTable(table);

    try {
      descriptor.mapInheritedAttributesToRootMinusOne();
    } catch (ClassNotFoundException ex) {
      throw new RuntimeException(ex);
    }

    descriptor.getCachingPolicy().setCacheType(MWCachingPolicy.CACHE_TYPE_FULL);

    // inheritance policy
    descriptor.addInheritancePolicy();
    MWRelationalDescriptorInheritancePolicy inheritancePolicy =
        (MWRelationalDescriptorInheritancePolicy) descriptor.getInheritancePolicy();
    inheritancePolicy.setReadSubclassesOnQuery(false);
    inheritancePolicy.setParentDescriptor(getFueledVehicleDescriptor());

    // multi-table info policy
    descriptor.addMultiTableInfoPolicy();

    MWTable fuelVehTable = tableNamed("FUEL_VEH");
    descriptor.addAssociatedTable(fuelVehTable);

    // direct to field mapping
    addDirectMapping(descriptor, "description", table, "DESCRIP");
    addDirectMapping(descriptor, "fuelType", fuelVehTable, "FUEL_TYP");

    // direct collection mapping
    MWRelationalDirectCollectionMapping partNumbersMapping =
        (MWRelationalDirectCollectionMapping)
            addDirectMapping(descriptor, "partNumbers").asMWDirectCollectionMapping();
    partNumbersMapping.setTargetTable(tableNamed("PARTNUMS"));
    partNumbersMapping.setDirectValueColumn(tableNamed("PARTNUMS").columnNamed("PART_NUM"));
    partNumbersMapping.setReference(tableNamed("PARTNUMS").referenceNamed("PARTNUMS_BUS"));
    partNumbersMapping.setUseNoIndirection();

    descriptor.removeMappingForAttribute(descriptor.getMWClass().attributeNamedFromAll("id"));
    descriptor.removeMappingForAttribute(descriptor.getMWClass().attributeNamedFromAll("owner"));
    descriptor.removeMappingForAttribute(
        descriptor.getMWClass().attributeNamedFromAll("passengerCapacity"));
    descriptor.removeMappingForAttribute(
        descriptor.getMWClass().attributeNamedFromAll("fuelCapacity"));
  }