...
<documentationOf>
<serviceEvent classCode="PCPR">
<effectiveTime>
<low value="20120519234435+0300"/>
<high value="20120619234435+0300"/>
</effectiveTime>
<performer typeCode="PRF">
<functionCode code="222" codeSystem="2.16.840.1.113883.2.9.6.2.7" codeSystemName="epSOSHealthcareProfessionalRolesISCO" displayName="Nursing and midwifery professionals"/>
<assignedEntity>
<id root="1.3.6.1.4.1.28284.6.2.4.32"/>
<assignedPerson>
<name>
<given>Patient Summary</given>
<family>Fetcher</family>
</name>
</assignedPerson>
</assignedEntity>
</performer>
</serviceEvent>
</documentationOf>
...