==4. Create References and Links==
References define which object types a connection (link) may point to, while links, implemented as a property of type Guid, actually establish this connection between two instances. Both elements are required to model directed relationships between objects within the UBIK® data model, e.g. to point from one object to another without needing a fixed parent-child structure.
To create a reference, navigate to Custom->Reference and drag Custom->Reference->REFERENCE into the BulkEditor (to access the content view, you must switch to the content area in the ClassBrowser). Then, specify the Name, Description, Namespace, and TargetType. When creating a new reference—for example, REF_ANLEITUNG—the corresponding metaclass ANLEITUNG must be set as the TargetType.
[[File:createReferencesAndLinks1.png|thumb400px|left]]