Every XFN name is interpreted relative to some context, and every XFN naming operation is performed on a context object. The initial context object provides a starting point for the resolution of composite names. The XFN interface provides a function that allows the client to obtain an initial context.
The policies described in Chapter 22, FNS Policies, specify a set of names that the client can expect to find in this context and the semantics of their bindings. This provides the initial pathway to other XFN contexts.