The Name Service Provider Interface (NSPI) Protocol provides messaging clients a way to access and manipulate addressing data stored by a server. This protocol consists of an abstract data model and a single remote procedure call (RPC) interface to manipulate data in that model.
Sections 1.8, 2, and 3 of this specification are normative and can contain the terms MAY, SHOULD, MUST, MUST NOT, and SHOULD NOT as defined in RFC 2119. Sections 1.5 and 1.9 are also normative but cannot contain those terms. All other sections and examples in this specification are informative.