HOWTO: Add New Relation Types

The relations displayed by default in the Nuxeo Platform use two vocabularies to provide the predicates:

• predicates: Provides the values of outgoing relations, which are also the values displayed in the drop down list when the user creates a new relation.
• inverse_predicates: Provides the incoming relation values.

The link between both vocabularies is done using the ID of the vocabulary entries: both must have the same ID.

To add a new relation type:

1. Add a new vocabulary entry in the predicates vocabulary.
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2. Add a new entry in the inverse_predicates vocabulary, using the same ID as the entry in the predicates vocabulary.
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   Your new relation type is immediately available.
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