i'm trying to parse the yang file but it not import the file why ?

[Priyanshukeshri]

module ietf-interfaces {

namespace "urn:ietf:params:xml:ns:yang:ietf-interfaces";
prefix if;

import ietf-yang-types {
prefix yang;
}

when i'm trying to parse these yang file it do not import the file even file in same folder, why ?