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Procedure
To create a content model, first choose Create Entity.

A window opens containing the existing entity types. ‘IO attribute’ is selected by default in the dialog box. However, to create a new content model, you first have to create a document area:

The document area you just created now appears in the entity tree in the main window. Finally, you have to activate the new entity.
Result
You have laid the foundation for a new content model. The rest of this documentation shows you how to create the remaining entities required.
