func (e *SimpleEventHandler) Add(s string) {
	e.items = append(e.items, s)
	e.levels = append(e.levels, e.current)
}
Add creates a string node at the current level.
package ogdl
type SimpleEventHandler struct {
	current int            
	max     int            
	levels  []int          
	items   []interface{}  
}
func (e *SimpleEventHandler) AddBytes(b []byte) {
	e.items = append(e.items, b)
	e.levels = append(e.levels, e.current)
}