Enhancement
Graphical model representation
Issue description
In complex data models modeling and programming in Topincs can be eased by providing visual support of the expanded enviromnet of a given topic type. Currently all means of support, the programming interface and the subject page of a topic type, give insights only the direct neighbors. Navigation helps partly, but overall it would be convenient to gain a bird's eye view of the model.
Developer comments
An admin should have the option at any time to pop up graphical representation of the data model given a topic type T1. Imagine the following: In the middle a rectangle represents T1 (as known from entitiy relationship modeling). Around it all topic types which are connected to T1 are displayed. There are lines to represent the actual connection (one per association type) and they should tell you about the cardinalities. If you click on one, it becomes the center.
This could be used to create traversal expressions for programming and also help to get a better idea of the model.
There could also be a drop down box of topic types. When you select on, it gives you all tranversal paths for programming.
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