<xs:element name="dates">
    <xs:annotation>
        <xs:documentation>All dates pertaining to the event, in particular the start and end date and any recurrence information</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:sequence>
            <xs:element name="start" type="ApproximateDateTimePropType">
                <xs:annotation>
                    <xs:documentation>The date the event commences.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:choice minOccurs="0">
                <xs:element name="end" type="ApproximateDateTimePropType">
                    <xs:annotation>
                        <xs:documentation>The date the event ends.</xs:documentation>
                    </xs:annotation>
                </xs:element>
                <xs:element name="duration">
                    <xs:annotation>
                        <xs:documentation>The period the event will last.</xs:documentation>
                    </xs:annotation>
                    <xs:complexType>
                        <xs:simpleContent>
                            <xs:extension base="xs:duration">
                                <xs:attributeGroup ref="commonPowerAttributes" />
                            </xs:extension>
                        </xs:simpleContent>
                    </xs:complexType>
                </xs:element>
            </xs:choice>
            <xs:group ref="RecurrenceGroup" minOccurs="0" />
            <xs:element name="confirmation" type="QCodePropType" minOccurs="0">
                <xs:annotation>
                    <xs:documentation>Flags to indicate if start and/or end date and times are confirmed.</xs:documentation>
                </xs:annotation>
            </xs:element>
        </xs:sequence>
        <xs:attributeGroup ref="commonPowerAttributes" />
    </xs:complexType>
</xs:element>