ex5.xml

<schema-mounts
    xmlns="urn:ietf:params:xml:ns:yang:ietf-yang-schema-mount">
  <namespace>
    <prefix>edt</prefix>
    <uri>http://example.org/device-types</uri>
  </namespace>
  <mount-point>
    <module>example-network-manager</module>
    <name>managed-device</name>
    <use-schema>
      <name>switch</name>
      <when>derived-from-or-self(../type, 'edt:switch-device')</when>
    </use-schema>
    <use-schema>
      <name>router</name>
      <when>derived-from-or-self(../type, 'edt:router-device')</when>
    </use-schema>
  </mount-point>
  <schema>
    <name>switch</name>
    <module>
      ...
    </module>
    ...
  </schema>
  <schema>
    <name>router</name>
    <module>
      ...
    </module>
    ...
  </schema>
</schema-mounts>