<xs:element name="Voucher">
    <xs:annotation>
        <xs:documentation xml:lang="en">Details of a paper or electronic document indicating prepayment.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:attributeGroup ref="VoucherGroup">
            <xs:annotation>
                <xs:documentation xml:lang="en">The effective date, expiry date and series code of the voucher.</xs:documentation>
            </xs:annotation>
        </xs:attributeGroup>
        <xs:attribute name="BillingNumber" type="StringLength1to64" use="optional">
            <xs:annotation>
                <xs:documentation xml:lang="en">Reference of the billing account which handles the payment transaction.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="SupplierIdentifier" type="StringLength1to64" use="optional">
            <xs:annotation>
                <xs:documentation xml:lang="en">Unique identifier of the electronic voucher, created by the supplier.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="Identifier" type="StringLength1to64" use="optional">
            <xs:annotation>
                <xs:documentation xml:lang="en">Unique identifier of the electronic voucher.</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="ValueType" type="StringLength1to32" use="optional">
            <xs:annotation>
                <xs:documentation xml:lang="en">Defines the type of voucher (e.g., full credit or partial credit).</xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="ElectronicIndicator" type="xs:boolean" use="optional">
            <xs:annotation>
                <xs:documentation xml:lang="en">When true, indicates the voucher is electronic.  An E-voucher is a value document issued by the Travel Agent for the customer. The e-voucher can be used as a proof of reservation, but more normally, as a full-payment or partial payment. </xs:documentation>
            </xs:annotation>
        </xs:attribute>
    </xs:complexType>
</xs:element>