module a {

       yang-version 1.1;

       namespace "urn:example:a";

       prefix "a";

       import b {

         prefix b;

         revision-date 2015-01-01;

       }

       import c {

         prefix c;

       }

       revision 2015-01-01;

       feature foo;

       augment "/b:x" {

         if-feature foo;

         leaf y {

           type b:myenum;

         }

       }

       container a {

         leaf x {

           type c:bar;

         }

       }

     }