UML PROFILE FOR SAVECCM - Research

UML
instances, it describes a set of instances that have features in common". A
Classifier represents a namespace whose members can include features.
4.5.1 Composite structures
CompositeStructures package introduces constructs for modelling internal
structures, interconnections and collaborations of elements. Constructs defined in
this package are used in the Components package to describe characteristics of a
Component metaclass.
CompositeStructures package contains five sub-packages, Collaborations,
InternalStructures, Ports, StructuredClasses and Actions. Each of them is shortly
described in this section.
4.5.1.1 InternalStructures package
The InternalStructures package has mechanisms for specifying structures of
interconnected elements that are created within an instance of a containing
classifier.
Internal subelements are defined using metaclass Property, and are called
parts. Internal structure is the implementation of a component by means of a set of
parts connected together in a specific way. Each part has a name and a type. A
name of the part defines its role within its owning classifier. Part’s type declares a
classifier that will be instantiated when instancing the part’s owning classifier.
Important characteristic of a part is its a multiplicity. The default multiplicity is
one, this means that there is one part instance in a component instance. If the
multiplicity is greater than one, then there will be more than one instance of a
particular part in a component instance.
A structure of this type represents a decomposition of classifier and is referred
to as its “internal structure”.
Figure 4-5 shows an example of internal structure. A "Cruise control"
component contains three parts with types: Mode, SpeedController,
DistanceController and with roles: modeLogic, speedCtrl, and distCtrl. When
instancing a Cruise control component, three instances of its parts will be created,
namely one instance of Mode, one instance of SpeedController and one instance
of DistanceController. For better clearness, interconnections between parts are not
presented. The Cruise control system example will be discussed in SaveCCM
section.
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