FunctionInvocation = FunctionName, [SP], '(', [SP], [(D,I,S,T,I,N,C,T), [SP]], [Expression, [SP], { ',', [SP], Expression, [SP] }], ')' ;
FunctionName = (Namespace, SymbolicName)
| (E,X,I,S,T,S)
;
Namespace = { SymbolicName, '.' } ;