<xs:complexType name="PeriodStructure">
<xs:choice>
<xs:element name="Dates">
<xs:complexType>
<xs:sequence>
<xs:element name="Start" type="xs:date" minOccurs="0" />
<xs:element name="End" type="xs:date" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="Event" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element ref="EventIdentifier" />
<xs:element ref="ElectionIdentifier" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="Permanent">
<xs:simpleType>
<xs:restriction base="xs:token">
<xs:enumeration value="yes" />
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:choice>
</xs:complexType>
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