![]() Classes may also have definitions of constraints, tagged values and stereotypes.Ĭlasses are represented by rectangles which show the name of the class and optionally the name of the operations and attributes. ![]() The behavior is described by the possible messages the class is able to understand, along with operations that are appropriate for each message. The strong, composite aggregations by the other connectors indicate ownership or containment of the source classes by the target classes, for example Contact and ContactGroup values will be contained in AddressBook.Ī class is an element that defines the attributes and behaviors that an object is able to generate. The lighter aggregation indicates that the class "Account" uses AddressBook, but does not necessarily contain an instance of it. ![]() The diagram below illustrates aggregation relationships between classes. Generalizations, aggregations, and associations are all valuable in reflecting inheritance, composition or usage, and connections respectively. Class diagrams are most useful in illustrating relationships between classes and interfaces. Class diagrams depict a static view of the model, or part of the model, describing what attributes and behavior it has rather than detailing the methods for achieving operations. The class diagram shows the building blocks of any object-orientated system. The model libraries must be imported into the user model as indicated.UML 2 Tutorial - Class Diagram Class Diagrams The HSUVModel may also require model libraries, such as the SI Units Types model library. The SysML Profile must be applied to this package to include stereotypes from the profile. Relating HSUV Model with Top-Level Package DiagramĪs shown in the top-level package diagram, the HSUVModel is a package that represents the user model. Note that the «view» models contain no model elements of their own and that changes to the model in other packages are automatically updated in the Operational and Performance Views. The relationship between the views (OperationalView and PerformanceView) and the rest of the user model are explicitly expressed using the «import» relationship. Model elements are contained in packages, and relationships between packages (or specific model elements) are shown on this diagram. The package diagram below shows the structure of the model used to evaluate the sample problem. Consequently, while a SysML Package may contain (provide a unique namespace for) Blocks and other SysML model elements, a SysML Block cannot own (be composed of) or contain SysML Packages or SysML diagrams.A SysML Block is the basic structural element used within a SysML model and is used analogously to how UML Classes are used to structure a UML object model.A SysML Package is capable of containing any arbitrary SysML model element, including (but not limited to) Blocks. Package import: Import all elements from another package to the namespaceĮlement import: Import one element from another package to the namespaceĪ Package is a generic grouping mechanism for organizing various model elements and related diagrams within a unique namespace. There are three major relationships model the dependency between packages:Ĭontainment: Contain packageable elements and other packages Note that model elements for both the block definition diagram and internal block diagram are contained in the Structure package. Each of these packages, in turn, contains model elements that are presented on the requirement diagram, activity diagram, block definition diagram, internal block diagram, and parametric diagram, respectively. In this diagram, the System Model appears in the diagram header and contains packages for Requirements, Behavior, Structure, and Parametrics. The package diagram, labeled pkg, is used to organize the model elements contained in the model. Package diagrams also provide a namespace for model elements.Package diagrams represent a compile-time grouping mechanism. ![]()
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