<xs:group name="RecurrenceGroup">
    <xs:annotation>
        <xs:documentation>A group of elements to express a recurrence (Group defined in this XML Schema only)</xs:documentation>
    </xs:annotation>
    <xs:sequence>
        <xs:choice maxOccurs="unbounded">
            <xs:annotation>
                <xs:documentation>This choice and its cardinality requires that there is at least one rDate or rRule element present.</xs:documentation>
            </xs:annotation>
            <xs:element name="rDate" type="DateOptTimePropType">
                <xs:annotation>
                    <xs:documentation>Explicit dates of recurrence.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="rRule">
                <xs:annotation>
                    <xs:documentation>Rule for recurrence.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:attributeGroup ref="recurrenceRuleAttributes" />
                    <xs:anyAttribute namespace="##other" processContents="lax" />
                </xs:complexType>
            </xs:element>
        </xs:choice>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
            <xs:element name="exDate" type="DateOptTimePropType">
                <xs:annotation>
                    <xs:documentation>Explicit dates to be excluded from any recurrence.</xs:documentation>
                </xs:annotation>
            </xs:element>
            <xs:element name="exRule">
                <xs:annotation>
                    <xs:documentation>Rule for dates to be excluded from recurrence.</xs:documentation>
                </xs:annotation>
                <xs:complexType>
                    <xs:attributeGroup ref="recurrenceRuleAttributes" />
                    <xs:anyAttribute namespace="##other" processContents="lax" />
                </xs:complexType>
            </xs:element>
        </xs:choice>
    </xs:sequence>
</xs:group>