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String name
The name of the function: a local name in the case of functions in the standard library, or a name with the conventional prefix "saxon:" in the case of Saxon extension functions
Class implementationClass
The class containing the implementation of this function (always a subclass of SystemFunction)
int opcode
Some classes support more than one function. In these cases the particular function is defined by an integer opcode, whose meaning is local to the implementation class.
int minArguments
The minimum number of arguments required
int maxArguments
The maximum number of arguments permitted
int cardinality
The cardinality of the result of the function
SequenceType[] argumentTypes
An array holding the types of the arguments to the function
Value[] resultIfEmpty
An array holding, for each declared argument, the value that is to be returned if an empty sequence as the value of this argument allows the result to be determined irrespective of the values of the other arguments; null if there is no such calculation possible