The specification of [application/ld+json](https://www.w3.org/TR/2018/WD-json-ld11-20181214/#iana-considerations) defines three profile URIs. The expected behavior when some other URI is given appears to be unspecified. If JSON-LD were to specify that - JSON-LD 1.1 processors should ignore (*) any other URI appearing in a profile parameter and - profile URIs matching http://www.w3.org/ns/json-ld* are explicitly reserved for future JSON-LD specifications this would provide an additional point of extensibility. (*) behave as if that URI were not present