<type>Attlist</type><name>agent</name><comment>The attribute by is used to identify the agent of an action. It is a reference to a TLCPerson or TLCOrganization element in the references section</comment>
<xsd:attributeGroup name="agent"><xsd:annotation><xsd:documentation><type>Attlist</type><name>agent</name><comment>The attribute by is used to identify the agent of an action. It is a reference to a TLCPerson or TLCOrganization element in the references section</comment></xsd:documentation></xsd:annotation><xsd:attribute name="by" type="agentRef" use="required"/></xsd:attributeGroup>