This tab contains a tree displaying the concepts and the relations.
Concepts are an abstract representation for an entity, for instance a table.
A relationship is a relation between two concepts.
To create a concept or a relation read the "Insert"-Menu.
To get more information about a concept or a relation doubleclick the element in the tree.
A dialog opens with more and detailed informations about the concept or the relation.
In this dialog you can also edit the concept or the relation.