Optional Readonlyassignmentwhen set, the call also binds a name, and is processed as that assignment first (setValidity)
Optional Readonlyassignmentlike assignment, for a call that states which of its arguments are target and source (setMethod)
Optional Readonlyclassthe arguments naming S4 classes the call uses (Class in new, signature in setMethod)
Optional Readonlyclasswhat the call states about the classes it relates, see classDeclarationOf
Optional Readonlygenericthe argument naming the S4 generic the call answers or asks about (f in setMethod)
Optional Readonlyregistersthe argument naming an S4 class the call adds to without declaring it (to in setAs): read and registered anew, so a later use depends on this call as well as on the declaration
Configuration of processClassRelation.