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is an interaction point that can be used to connect structured classifiers with their parts and with the environment. Ports can optionally specify the services they provide and the services they require from other parts of the system. In the diagram, each of the small squares is a port. Each port has
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Ports can either delegate received requests to internal parts, or they can deliver these directly to the behavior of the structured classifier that the port is contained within. Public ports that are visible in the environment are shown straddling the boundary, while protected ports that are not
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This UML 2.0 composite structure diagram specifies that instances of the 'FibonacciSystem' class are composed of a number of parts. The topmost of these parts is identified as having the classifier 'FibonacciFunction'. Three of the parts are identified by the role they play within instances of
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visible in the environment are shown inside the boundary. All the ports in the diagram are public, except for the view port along the right boundary of
FibonacciSystem.
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binds two or more entities together, allowing them to interact at runtime. The connector is shown as a line between some combination of parts, ports and structured
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The key composite structure entities identified in the UML 2.0 specification are structured classifiers, parts, ports, connectors, and collaborations.
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is generally more abstract than a structured classifier. It is shown as a dotted oval containing roles that instances can play in the collaboration.
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through which the parts interact with each other or through which instances of the class interact with the parts and with the outside world, and
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a type and is labelled with a name, such as "var", "indVar1", or "view" in the diagram. Ports may contain a multiplicity factor, for example .
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represents a class, often an abstract class, whose behavior can be completely or partially described through interactions between parts.
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is a set of interconnected elements that collaborate at runtime to achieve some purpose. Each element has some defined
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At runtime the class instances that implement these three roles must provide the services specified by the
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including the official UML 2.0 specification. See especially the large section on
Composite Structures.
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The port named "view" is a non-public port that can be used by an instance of
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As an example, consider one possible way of modeling production of the
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OMG Unified
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is a type of structured classifier that contains ports. In the
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represents a role played at runtime by one instance of a
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