<xs:complexType name="ProcessingUnitStructure">
<xs:sequence>
<xs:element name="Name" type="xs:token" minOccurs="0" />
<xs:element name="Id" type="xs:token" />
</xs:sequence>
<xs:attribute name="Role" use="required">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="next receiver" />
<xs:enumeration value="previous sender" />
<xs:enumeration value="receiver" />
<xs:enumeration value="sender" />
<xs:enumeration value="" />
</xs:restriction>
</xs:simpleType>
</xs:attribute>
</xs:complexType>
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