Defines the structural information associated with a bus type, independent of the abstraction level. This element indicates that a initiator interface may be directly connected to a target interface (under certain conditions) for busses of this type. This element indicates that this bus definition supports 'broadcast' mode. This means that it is legal to make one-to-many interface connections. If true, indicates that this is an addressable bus. Optional name of bus type that this bus definition is compatible with. This bus definition may change the definitions in the existing bus definition Indicates the maximum number of initiators this bus supports. If this element is not present, the number of initiators allowed is unbounded. Indicates the maximum number of targets this bus supports. If the element is not present, the number of targets allowed is unbounded. Indicates the list of system group names that are defined for this bus definition. Indicates the name of a system group defined for this bus definition.