Requirements

The following requirements are should be fulfilled by the graphical editing frameworks.

Elements (E):

1. Classes with name, attributes and methods
2. Groups with name, groups can be nested
3. Relations / Associations with 3 labels in different styles
4. Relations should support layered styles
5. Configuration editor (with validity verification)

Functional (F):

1. step into groups (in the same editor and maybe open in new editor)
2. adaptable edit policies to disable some features (e.g. creating a relation between two classes)
3. relations between relations
4. toolkit palette view (changeable)
5. configuration context menu (rightclick, context buttons, etc.)

Non-Functional (N):

1. Framework provides a stable API (avoid breaking changes)
2. Framework will be supported for around 5 years
3. Framework is open-source and licensed to use for research and teaching