Parts are owned by composition and the composite structure diagram models how the parts are connected in the containing classifier. Each part is a specific usage of a type. The type defines the kinds of objects that can be bound, or referenced, to a role. You can have multiple parts with the same type and each part can have a different set of relationships to other parts. You can join parts with connectors to specify the communication between them.
As the following figure illustrates, a part is displayed in the diagram frame as a solid rectangle that contains the name of the part, the type, and any specified multiplicity. A class icon is displayed in the top right corner of the part.
