Section: A.6.2 Reusability
Content: The following design guidelines are used for specifying NF services to be reusable. - NF service operations are specified such that other NF can potentially invoke them in future, if required. - The service operations may be usable in multiple system procedures specified in clause 4 of this specification. - Using clause 4 of the current document, the system procedures in which the NF service operations can be used are considered and based on that the parameters for the NF service operations are clearly listed. NOTE: It is possible that, when mapping an end to end call flow to service based architecture, one step in the call flow may map to multiple NF service operation invocations. This specification clearly identifies each NF service operation invocation in the call flow. Protocol optimization of multiple NF service operation invocations are left for TS 29.500[ 5G System; Technical Realization of Service Based Architecture; Stage 3 ]  [17] consideration.