<?xml version="1.0" encoding="UTF-8"?>
<searchRetrieveResponse xmlns="http://www.loc.gov/zing/srw/">
  <version>1.2</version>
  <numberOfRecords>0</numberOfRecords>
  <diagnostics>
    <diagnostic xmlns="http://www.loc.gov/zing/srw/diagnostic/">
      <uri>info:srw/diagnostic/1/7</uri>
      <details>query</details>
      <message>Mandatory parameter not supplied</message>
    </diagnostic>
  </diagnostics>
</searchRetrieveResponse>