Use Case Diagram ;<extend>>),箭头从子用例指向基用例。包含(include):include为包含关系,当两个或多个用例中共用一组相同的动作,这时可以将这组相同的动作抽出来作为一个独立的...此贴转自:peterwei (主题:UML用例图之泛化(generalization)、扩展(extend)和包含(include)关系--UML一波流系列讲解),仅做以后工作...
Use Case Diagram 例,即使没有子用例的参与,也可以完成一个完整的功能。extend的基用例中将存在一个扩展点,只有当扩展点被激活时,子用例才会被执行。extend关系在用例图中使用带箭头的虚线表示(在线上标注<<extend>;>),箭头从子用例指向基用例。包含(include):include为包含关系,当两个或多个用例中共用一组相同的...
This section describes the Extend Notation used in a UML Use Case Diagram. An Extend Notation presents an extension relation between two use cases where one acts as the base use case and the other acts as an add-on use case.
On the Semantics of the Extend Relationship in Use Case Models 411 2 The Extend Relationship in the UML Documentation A use case describes an interaction between one or more actors and the system as a sequence of messages. Thus, a use case diagram has two types of nodes: actors and use ...
You can find the description of each property In the same window. Descriptions are presented in the description area of the Specification window. Editing property values For more information about specifying property values, see Editing property values. Related pages Use Case Diagram Formatting ...
Extension Point in Use Case Diagram An extension point in a use case diagram represents a point in a use case where behavior can be extended or modified by another use case. It is a specific point within a use case where an extension use case can be connected to...
(The Note might not initially display close to the Extend connector - check the upper left corner of the diagram and drag the Note to the position you want it to occupy.) Use these same steps to change the extension point identified in the Note.Show...
For example, adding the “UseCaseDesignerExtension” attribute will make the extension appear in a UML Use Case Diagram too. Now, you must implement three things – Execute, QueryStatus, and Text. “Text” is the text of the menu item that will appear in Visual Studio. When the u...
Elements can also be obtained based on traversability using theBy traversabilityextension type. In this case, network elements are appended to the diagram if they allow the network commodity to continue through to the next elements. For example, a diagram with a portion of a pipe network in it...
A set of behavior segments that may be inserted in a base use case Extend relationships do not have names. As the following figure illustrates, an extend relationship is displayed in the diagram editor as a dashed line with an open arrowhead pointing from the extension use case to the base ...