<xs:attributeGroup name="QueueGroup">
    <xs:annotation>
        <xs:documentation xml:lang="en">Information to identify a queue.</xs:documentation>
    </xs:annotation>
    <xs:attribute name="PseudoCityCode" type="StringLength1to16" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">The ATA/IATA airport/city code, office code, pseudo city code, etc. of the queue.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="QueueNumber" type="AlphaNumericStringLength1to8" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">An identifier specifying the queue on which the booking file resides in the system.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="QueueCategory" type="AlphaNumericStringLength1to8" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">The category of the queue.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="SystemCode" type="StringLength1to8" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">Identifies the airline and/or system where the queue resides. If this is omitted, the airline and/or system code (AirlineVendorID) contained in the point of sale information should be used.</xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="QueueID" type="AlphaNumericStringLength1to8" use="optional">
        <xs:annotation>
            <xs:documentation xml:lang="en">An additional identifier to determine the exact queue on which a reservation record should be placed</xs:documentation>
        </xs:annotation>
    </xs:attribute>
</xs:attributeGroup>