<xsd:simpleType name="PreferLevel_Enum">
    <xsd:annotation>
        <xsd:documentation source="Description">Used to specify a preference level for something that is or will be requested (e.g. a supplier of a service, a type of service, a form of payment, etc.).</xsd:documentation>
        <xsd:appinfo>
            <otm:OTA2Entity type="EnumerationClosed" xmlns:otm="http://www.OpenTravel.org/ns/OTA2/AppInfo_v01_00">PreferLevel_Enum</otm:OTA2Entity>
        </xsd:appinfo>
    </xsd:annotation>
    <xsd:restriction base="xsd:string">
        <xsd:enumeration value="Only">
            <xsd:annotation>
                <xsd:documentation source="Description">Preference level that indicates request is only for a specific criterion.</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="Unacceptable">
            <xsd:annotation>
                <xsd:documentation source="Description">Preference level that indicates request is unnacceptable for a specific criterion.</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="Preferred">
            <xsd:annotation>
                <xsd:documentation source="Description">Preference level that indicates request is preferred for a specific criterion.</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="Required">
            <xsd:annotation>
                <xsd:documentation source="Description">Preference level that indicates request is required for a specific criterion.</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
        <xsd:enumeration value="NoPreference">
            <xsd:annotation>
                <xsd:documentation source="Description">Preference level that indicates there is no preference.</xsd:documentation>
            </xsd:annotation>
        </xsd:enumeration>
    </xsd:restriction>
</xsd:simpleType>