Argument Count

getMinimumNumberOfArguments() and getMaximumNumberOfArguments() define the allowed number of arguments.

Note: For a no-argument function such as getNextGUID, both of these methods return 0.

@Override public int getMinimumNumberOfArguments() { return 0; } @Override public int getMaximumNumberOfArguments() { return 0; }

Argument Types

getArgumentTypes() defines the Saxon argument types.

Note: For a no-argument function, it returns an empty SequenceType array.

@Override public SequenceType[] getArgumentTypes() { return new SequenceType[0]; }

For a single string argument, the structure would look like this:

@Override public SequenceType[] getArgumentTypes() { return new SequenceType[] { SequenceType.SINGLE_STRING }; }

Return Type

getResultType(...) defines the Saxon return type. For a function that returns a GUID string, use SequenceType.SINGLE_STRING.

@Override public SequenceType getResultType(SequenceType[] suppliedArgs) { return SequenceType.SINGLE_STRING; }