<prov:document
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:prov="http://www.w3.org/ns/prov#"
    xmlns:ex="http://example.com/ns/ex#">

  <prov:activity prov:id="ex:a1">
    <prov:type xsi:type="xsd:string">traffic regulations enforcing</prov:type>
  </prov:activity>

  <prov:activity prov:id="ex:a2">
    <prov:type xsi:type="xsd:string">fine paying, check writing, and mailing</prov:type>
  </prov:activity>

  <prov:wasInformedBy>
    <prov:informed prov:ref="ex:a2"/>
    <prov:informant prov:ref="ex:a1"/>
  </prov:wasInformedBy>

</prov:document>