ex1.xml

<schema-mounts
    xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-schema-mount">
  <mount-point>
    <module>example-logical-devices</module>
    <name>logical-device</name>
    <use-schema>
      <name>logical-device</name>
    </use-schema>
  </mount-point>
  <schema>
    <name>logical-device</name>
    <module>
      <name>ietf-interface</name>
      <revision>2014-05-08</revision>
      <namespace>
        urn:ietf:params:xml:ns:yang:ietf-interfaces
      </namespace>
      <conformance-type>implement</conformance-type>
    </module>
    <module>
      <name>ietf-ip</name>
      <revision>2014-06-16</revision>
      <namespace>
        urn:ietf:params:xml:ns:yang:ietf-ip
      </namespace>
      <conformance-type>implement</conformance-type>
    </module>
    <module>
      <name>ietf-system</name>
      <revision>2014-08-06</revision>
      <namespace>
        urn:ietf:params:xml:ns:yang:ietf-system
      </namespace>
      <conformance-type>implement</conformance-type>
    </module>
    <module>
      <name>ietf-yang-types</name>
      <revision>2013-07-15</revision>
      <namespace>
        urn:ietf:params:xml:ns:yang:ietf-yang-types
      </namespace>
      <conformance-type>import</conformance-type>
    </module>
  </schema>
</schema-mounts>