Dragon1 EA Method


    dragon1 UML

    What is UML, the Unified Modeling Language?

    UML is an open modeling language, mainly to design software applications and information systems with.

    The UML Meta Model

    dragon1 UML class

    UML is about object oriented analyses and design. UML defines that every entity, like a software application, a house or a person, is an instance of a class. And that class has attributes (like a name, version and type) and has methods (like starting up, protecting and walking).

    Everything in an UML model is a model element, like you can see here below in the simplified UML meta model. This meta model enables for instance users to create class models and visualize them as class diagrams.

    dragon1 UML meta model

    UML Structural Entities

    Any diagram of UML shows structural entities. The defined structural entities in UML are:

    • Class
    • Object
    • Interface
    • Collaboration
    • Use Case
    • Actor
    • State
    • Node
    • Component
    • Package

    The standard diagram types

    In UML twelve standard diagram typs are recognized:

    • Class Diagram
    • Component Diagram
    • Deployment Diagram
    • Object Diagram
    • Package Diagram
    • Profile Diagram
    • Composite Structure Diagram
    • Use Case Diagram
    • Activity Diagram
    • State Machine Diagram
    • Sequence Diagram
    • Communication Diagram
    • Interaction Overview Diagram
    • Timing Diagram

    On Dragon1 you can design your software applications using UML and you can create all of these Diagram Types.

    Use Case Diagram

    The first diagram you create when working with UML is a Use Case Diagram. In this diagram, you identify the stakeholders or users that will make use of the software application and also what they primarily want or need to use the software application for.

    dragon1 UML diagram

    Class Diagram

    Below is an example class diagram. A class diagram shows how the world your software application will know, looks like or can exist of.

    dragon1 class diagram

    Sequence Diagram

    Because interaction can get really complicated in a software application or information system, it is a very wise thing to create a sequence diagram like the one below to visualize what should happen, in what order.

    dragon1 uml sequence diagram

    UML Rules and Naming Convention

    Every modeling language requires rules and naming conventions so that the group using the language create pieces of work that fit together. UML does not prescribe how to model and name classes, etc.. in detail. As an architect or team of architects that want to use UML you have to put an effort into creating your own modeling rules and naming conventions.