See: <a href="/doc/reference/classes/ucalc.callback/argcount/">ArgCount</a>, <a href="/doc/reference/classes/ucalc.callback/argitem/">ArgItem</a>, <a href="/doc/reference/classes/ucalc.item/datatype-=-[datatype]/">DataType = [DataType]</a>, <a href="/doc/reference/classes/ucalc/definefunction/">DefineFunction</a>, <a href="/doc/reference/classes/ucalc.datatype/name-=-[string]/">Name = [string]</a>, <a href="/doc/reference/classes/ucalc.item/valuestr/">ValueStr</a>