How to create the "Use-Case" Diagram by means of EMF

simple question.

Why Eclipse Modelling Framework doesn't support Use-Case diagram ?

There are many diagrams, but no use-case:

also, i study the tutorial at Eclipse Modeling Framework (EMF) - Tutorial and just created a "Ecore Modelling Project". I was not able to create any "Use-case" diagram.

thanks for reply

In general, the goal of EMF is to specify modeling languages, like activity or class diagrams. Editors for the UML language have been implemented based on the capabilities of EMF, such as the Papyrus, MagicDraw or UML Designer tools (but there are others as well). Assuming you are looking for an UML modeler, you should look at the specific Eclipse-based UML tools.

EMF on the other hand provides a few modeling languages that ease the definition of other modeling languages, most notable the ones called 'Ecore' and 'Generator model'.

It is possible to install both EMF and concrete modeling languages in the same Eclipse installation, but they have very different purposes.