Defines the structural information associated with a bus type, independent of the abstraction level. This element indicates that a master interface may be directly connected to a slave interface (under certain conditions) for busses of this type. 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 masters this bus supports. If this element is not present, the number of masters allowed is unbounded. Indicates the maximum number of slaves this bus supports. If the element is not present, the number of slaves 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. String for describing the bus definition to users; no semantic impact