R-59610 The xNF **MUST** implement the data model discovery and
download as defined in [RFC6022].
-R-87662 The xNF **SHOULD** implement the NETCONF Event Notifications
-[RFC5277].
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R-93443 The xNF **MUST** define all data models in YANG [RFC6020],
and the mapping to NETCONF shall follow the rules defined in this RFC.