public EntityType::getLinkTemplates()
Gets the link templates using the URI template syntax.
Links are an array of standard link relations to the URI template that should be used for them. Where possible, link relationships should use established IANA relationships rather than custom relationships.
Every entity type should, at minimum, define "canonical", which is the pattern for URIs to that entity. Even if the entity will have no HTML page exposed to users it should still have a canonical URI