Modeling Diagrams
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Modeling diagrams can be thought of as graphs with nodes (vertices) and links (edges) between them that are arranged according to a certain algorithm.
Each modeling diagram belongs to a certain diagram type. For example, your diagram can be of the class diagram type. See UML 1.5 diagram types and UML 2.0 diagram types.
We will use the term model element to nodes, links, and any other components that you can put on your modeling diagrams. The set of model elements available for use on a diagram depends on the diagram type. Available model elements are displayed in the Tool Palette. See descriptions of model elements available for different diagram types in appropriate topics in UML 1.5 diagram types and UML 2.0 diagram types. For example, look at UML 1.5 Class Diagram Elements or UML 1.5 Use Case Diagram Elements.
A modeling diagram exists within the context of a namespace (or a package). You have to create or open a project before creating a new diagram. When you activate the Modeling Support for your project, the default project-level package diagram is created automatically. You can create various modeling diagrams in your projects.
In addition to the standard properties of modeling diagrams and their elements, you can create user properties represented by the Name and Value pairs.
A link can have the label. You can move this label to any point of the link line.