model-1_4.sdf

<?xml version="1.0" ?>
<sdf version="1.4">
  <model name="door_handle">
    <link name="handle">
      <collision name="collision">
        <geometry>
          <mesh>
            <uri>model://door_handle/meshes/door_handle.dae</uri>
          </mesh>
        </geometry>
      </collision>

      <visual name="visual">
        <geometry>
          <mesh>
            <uri>model://door_handle/meshes/door_handle.dae</uri>
          </mesh>
        </geometry>
      </visual>
    </link>
  </model>
</sdf>