Provenance holding a signature (id = "signature")

<?xml version="1.0" encoding="UTF-8"?>

<Provenance xmlns="http://hl7.org/fhir">
  <id value="signature"/> 
  <!--  
  <text>
    <status value="extensions"/>
    <div xmlns="http://www.w3.org/1999/xhtml">procedure record authored on 27-June
   2015 by Harold Hippocrates, MD Content extracted from Referral received 26-June</div>
  </text>
  -->
  <!--   
    where possible, provenance targets should be version specific,
    so that there is no ambiguity about which version of the 
    record this relates to
    -->
  <target> 
    <reference value="DocumentReference/example/_history/4"/> 
  </target> 
  <recorded value="2015-08-27T08:39:24+10:00"/> 
  <authorization> 
    <concept> 
      <coding> 
        <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/> 
        <code value="TREAT"/> 
        <display value="treatment"/> 
      </coding> 
    </concept> 
  </authorization> 
  <activity> 
    <coding> 
      <system value="http://terminology.hl7.org/CodeSystem/v3-DocumentCompletion"/> 
      <code value="AU"/> 
      <display value="authenticated"/> 
    </coding> 
  </activity> 
  <!--   signer = Harold Hippocrates   -->
  <agent> 
    <type> 
      <coding> 
        <system value="http://terminology.hl7.org/CodeSystem/contractsignertypecodes"/> 
        <code value="VERF"/> 
      </coding> 
    </type> 
    <!--   very often, the user won't have a known system - these aren't available 
      for security system log ons. But where you can define it, you should.
      Most of the time the userId is fully qualfied such as an email address   
       -->
    <who> 
      <identifier> 
        <system value="urn:ietf:rfc:3986"/> 
        <value value="mailto://hhd@ssa.gov"/> 
      </identifier> 
    </who> 
  </agent> 
  <signature> 
    <!--   verification signature   -->
    <type> 
      <system value="urn:iso-astm:E1762-95:2013"/> 
      <code value="1.2.840.10065.1.12.1.5"/> 
      <display value="Verification Signature"/> 
    </type> 
    <when value="2015-08-27T08:39:24+10:00"/> 
    <who> 
      <reference value="Practitioner/xcda-author"/> 
    </who> 
    <targetFormat value="application/fhir+xml"/> 
    <sigFormat value="application/signature+xml"/> 
    <data value="Li4u"/> 
  </signature> 
</Provenance>