Function xmlhelper::decode::fold_elements

pub fn fold_elements<S: XmlEventStream, State, F>(
    stream: &mut S, 
    state: State, 
    f: F
) -> Result<State> where
    F: FnMut(&mut ElementScopedStream<S>, &mut State) -> Result<()>, 

Consume all elements of a stream, fold them to a value