Unique resource name of the entity, e.g. entityTypes/entityTypeIdentifier/entities/entityIdentifier or entityTypes/namespace1.entityTypeIdentifier/entities/namespace2.entityIdentifier. The namespaces must be empty (being global) or one of the predetermined namespaces the customer has access to. If namespace1 is not empty, it must be equal to namespace2. The entity identifier must match the regex \w[\w-]{0,63}.