AnswerResolver typedef
AnswerResolver =
AnswerValue? Function(String text, TreeElement element, FormDef form)
Turns a saved answer's text into a typed answer for element.
Port of IAnswerResolver (JavaRosa sets it statically on the parser;
here it is passed to XFormInstanceLoading.loadXmlInstance).
Implementation
typedef AnswerResolver =
AnswerValue? Function(String text, TreeElement element, FormDef form);