test yaml-cpp 0.5.3 issue -

i tried know yaml rules.
, init.yaml file this:

name: ryan braun position: lf 

main code:

int main() {     yaml::node node = yaml::loadfile("init.yaml");     cout << node.type() << endl;    return 0; }   

this simple example, want see node's type. should map described in how emit yaml. output 0, means undefined. makes me confused. maybe misunderstand.
suggestions thankful.