Reset this Validator to its original configuration.
Validator is reset to the same state as when it was created with
Schema.newValidator().
reset() is designed to allow the reuse of existing Validators
thus saving resources associated with the creation of new Validators.
The reset Validator is not guaranteed to have
the same LSResourceResolver or ErrorHandler
Objects, e.g. Object.equals(Object obj).
It is guaranteed to have a functionally equal
LSResourceResolver and ErrorHandler.
Diagram: validation