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  • Paul Painter thinks this is interesting:

There are other types of resources that can be considered more as properties of a parent entity rather than entities in their own right. These can pose a challenge when attempting to streamline the level of resource identifier abstraction, because we need to start trading off between the amount of knowledge that consumers have about the service contract and the number of officially registered relationship types that exist as part of the uniform contract.

From

Cover of SOA with REST: Principles, Patterns & Constraints for Building Enterprise Solutions with REST

Note

Important point impacting coupling in REST API