You can create new diagrams in models or in several model
elements, such as packages, collaborations, classes, or state machines.
You can create several diagrams of different types in a single model
or model element.
Creating modeling diagrams in model elements
You can provide more detail about a model element, such as a package, component, or state machine, by creating a diagram in it. You can create several diagrams of different types in a single model element.