2.2.6.3.15 Links and Subtypes
Entity instances in an EntitySet MAY not belong to the same EntityType but MUST all be derived from the EntityType baseType associated with the EntitySet. In the OData 3.0 protocol, in addition to the rules described in Entity Type (as a JSON object) (section 2.2.6.3.3), the value of the ResourcePath for the following grammar rules (described in Entity Type (as a JSON object) (section 2.2.6.3.3),) SHOULD include the EntityType instance (as described in Resource Path (resourcePath) (section 2.2.3.3)):
uriNVP
associationuri
editMediaNVP
mediaSrcNVP