<record>
  <controlfield tag="001">172</controlfield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">firewall</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">usability</subfield>
  </datafield>
  <datafield tag="653" ind1="1" ind2=" ">
    <subfield code="a">security</subfield>
  </datafield>
</record>