A basic rule learnt in the Internet Community in the US is that in
communicating systems, software should be ;SPM_quot;conservative;SPM_quot; in what it
transmits;SPM_quot; and ;SPM_quot;liberal;SPM_quot; in what it receives.
This means that if some large number of optional parameters are
feasible when invoking a particular operation, avoid them unless they
are required. However, on receiving an operation, be prepared to
parse/check all possible options for sanity/correctness.
A basic set of rules emerge for sanity checking: