th what would be produced by the standard
          JSON-LD 1.0 Processing Algorithms and API [[!JSON-LD-API]] Compaction
          Algorithm using, at least, the normative JSON-LD @context definition
          provided <a href="https://www.w3.org/ns/activitystreams">here</a>.
          Implementations MAY augment the provided @context with additional
          @context definitions but MUST NOT override or change the normative
          context. Implementations MAY also use additional properties and values
