<xs:attributeGroup name="PromotionCodeGroup">
    <xs:annotation>
        <xs:documentation xml:lang="en">Used to provide a promotion code.</xs:documentation>
    </xs:annotation>
    <xs:attribute name="PromotionCode" type="StringLength1to32" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">Promotion code is the identifier used by the host to link directly with a specific named advertising campaign. By including the required code, the client is able to gain access to special offers which may have been created for a specifically targeted group via a CRM system or for a wider advertising campaign using Television or press adverts.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="PromotionVendorCode" type="ListOfStringLength1to8" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">List of the vendor codes associated with a promotion.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
</xs:attributeGroup>