An alternative combined fragment is used to specify an area of a group of lifelines/ actors to show conditional flow in a sequence diagram. It also models the if-then-else logic in the sequence diagram. In this page, we will demonstrate how to draw a simple sequence diagram with applying alternative combined fragment.
With VP-UML, you are able to show model elements in various diagrams to fit into different contexts. Two ways are provided to assist you in reusing model elements in different diagrams. This article will teach you firstly dragging and dropping from the tree to the diagram, secondly copying and pasting between diagrams and finally showing views.
Majority of products in the market though allow users to create multiple messages which results in confusion with multiple arrows on a message link. What even worse is that you find it hard to delete a specific message among various messages. With VP-UML, you can not only combine numerous messages into a combined message with just one arrow, but also delete a specific message of the combined message instead of all messages.
An association class, which is essentially a class attached to an association, is used to model an association as a UML class. It has its own name, attributes operations, just like any other ordinary class. However, it is described by additional attributes which does not belong to the objects involved in the association. For example, an Enrollment class is added to hold the attribute year between Student class and Course class, but it does not belong to either Student class or Course class.
Properties or tags are used to keep information about use case and can be viewed in Use Case Details. In there, you will see a number of fields such as level, complexity and author that are provided by default. In VP-UML, if you need to store additional information in use case details, you can create custom fields to do that.