You can add model elements to
a UML model so that they become part of the model, but are not part
of a diagram, or you can add elements to a diagram, in which case
they are added to the model as well as the diagram.
About this task
Models contain one or more model elements. The
Project
Explorer view lists the model elements in each model.
To
add model elements:
What to do next
Note: If you set
preferences to filter or hide model elements, the Project
Explorer view may not display the element that you added.