Iteration callback delegate type alias. The delegate must either use
an appropriate GetField (or subclass) instance to handle and move
the parser to the end of the field or indicate that this field is
ignored and unhandled.
true if an appropriate GetField (or subclass) instance was used
to handle and move the parser to the end of the field or false
if the field is ignored and unhandled and should be skipped.
Iteration callback delegate type alias. The delegate must either use an appropriate GetField (or subclass) instance to handle and move the parser to the end of the field or indicate that this field is ignored and unhandled.