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Keep in mind, your currently enabled Entity model is defined in your database, and NOT in the "relationship-types.xml".  Anytime you want to update your data model, you'd update/create a configuration (like relationship-types.xml) and re-run the "initialize-entities" command.

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Configure Collections for each Entity type

Because all Entities are Items, they MUST belong to a Collection.  Therefore, the recommended way to create a different submission forms per Entity type (e.g. Person, Project, Journal, Publication, etc) is to ensure you create a Collection for each Entity Type (as each Collection can have a custom Submission Form).  

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