<xs:element name="TicketBox" minOccurs="0">
    <xs:annotation>
        <xs:documentation source="Description" xml:lang="en">A baggage allowance descriptor.</xs:documentation>
        <xs:documentation source="Developer" xml:lang="en">Example: PC = per piece, 2PC = 2 pieces, nn = per weight (nn is the weight limit). A blank string is also allowed in this element.</xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:simpleContent>
            <xs:extension base="xs:string">
                <xs:attribute name="Concept" use="optional">
                    <xs:annotation>
                        <xs:documentation source="Description" xml:lang="en">The value type.</xs:documentation>
                    </xs:annotation>
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="Piece" />
                            <xs:enumeration value="Weight" />
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>
            </xs:extension>
        </xs:simpleContent>
    </xs:complexType>
</xs:element>