type WellKnownList []WellKnown

func (w WellKnownList) ToStringArray() []string {
	out := make([]string, 0, len(w))
	for _, item := range w {
		out = append(out, item.String())
	}
	return out
}

func AllWellKnown() WellKnownList {
	return []WellKnown{From, To, Namespace, SystemNamespace}

			} else {
				// No well-known parameters are missing.
				out.complete = append(out.complete, s)
			}

			// Delete all the wellknown parameters.
			need.DeleteAll(param.AllWellKnown().ToStringArray()...)
			if len(need) > 0 {
				panic(fmt.Sprintf("config source missing parameters: %v", need))
			}
		}
	}

	return out
}