pub(crate) trait XPathResultMethods<D: DomTypes> {
// Required methods
fn ResultType(&self) -> u16;
fn GetNumberValue(&self) -> Fallible<f64>;
fn GetStringValue(&self) -> Fallible<DOMString>;
fn GetBooleanValue(&self) -> Fallible<bool>;
fn GetSingleNodeValue(&self) -> Fallible<Option<DomRoot<D::Node>>>;
fn GetInvalidIteratorState(&self) -> Fallible<bool>;
fn GetSnapshotLength(&self) -> Fallible<u32>;
fn IterateNext(&self) -> Fallible<Option<DomRoot<D::Node>>>;
fn SnapshotItem(&self, index: u32) -> Fallible<Option<DomRoot<D::Node>>>;
}