<xs:element name="OriginDestinationOption" maxOccurs="99">
    <xs:annotation>
        <xs:documentation xml:lang="en">A container for OriginDestinationOptionType.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:complexContent>
            <xs:extension base="OriginDestinationOptionType">
                <xs:attribute name="RefNumber" type="Numeric1to99" use="optional">
                    <xs:annotation>
                        <xs:documentation xml:lang="en">When a PricedItinerary element contains multiple solutions and a single price, this attribute identifies the OriginDestinationPair from the request. </xs:documentation>
                    </xs:annotation>
                </xs:attribute>
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
</xs:element>