This Recommendation specifies design guidelines for the Capability exchange-enabled AHD and Capability exchange-enabled WAN CDCs. The design guidelines specify the testable requirements that must be implemented by the AHD in order to classify it as a Capability exchange-enabled AHD. The Capability exchange-enabled AHD shall be able to retrieve a root file from the WAN device and be able to validate that the root file conform to the HL7 hData hRF document. In addition@ the design guidelines specify testable requirements for a WAN device which details how a Capability exchange-enabled WAN device shall respond to the requests from a Capability exchange-enabled AHD and shall be able to validate that the root document conform to the HL7 hData hRF document.