Messages Catalog Catalog (json) Catalog error message (json) Catalog request message (json) Dataset (json) Dataset request message (json) Contract Negotiation Contract agreement message (json) Contract agreement verification message (json) Contract negotiation (json) Contract negotiation error (json) Contract negotiation event message (json) Contract negotiation termination message (json) Contract offer message (json) Contract request message (json) Transfer Process Transfer completion message (json) Transfer error (json) Transfer prcess (json) Transfer request message (json) Transfer start message (json) Transfer suspension message (json) Transfer termination message (json)