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SAE J2735-Draft-Rev28 [issued: 11-10-08] 
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
         </xs:simpleType>
         <xs:simpleType>
            <xs:restriction base="xs:string">
               <xs:enumeration value="north"/>
               <xs:enumeration value="south"/>
               <xs:enumeration value="east"/>
               <xs:enumeration value="west"/>
               <xs:enumeration value="northeast"/>
               <xs:enumeration value="northwest"/>
               <xs:enumeration value="southeast"/>
               <xs:enumeration value="southwest"/>
            </xs:restriction>
         </xs:simpleType >
      </xs:union>
</xs:simpleType>
8.2 Data Element: DE_Extent [ATIS]
Use: The spatial distance over which this message applies and should be presented to the driver.  Under
certain conditions some messages may never be shown to the driver of a vehicle if they are short in
duration and other conflicting needs supercede the display until such time as the subject message is no
longer relevant.
ASN.1 Representation:
Extent ::= ENUMERATED {
    useInstantlyOnly   (0),
    useFor3meters      (1),
    useFor10meters     (2),
    useFor50meters     (3),
    useFor100meters    (4),
    useFor500meters    (5),
    useFor1000meters   (6),
    useFor5000meters   (7),
    forever          (255)  -- very wide area
    }
    -- encode as a single byte
XML Representation:
<xs:simpleType name="Extent" >
      <xs:annotation>
         <xs:appinfo>
            useInstantlyOnly (0)
            useFor3meters (1)
            useFor10meters (2)
            useFor50meters (3)
            useFor100meters (4)
            useFor500meters (5)
            useFor1000meters (6)
            useFor5000meters (7)
            forever (255) -- very wide area
         </xs:appinfo>
         <xs:documentation>       
            encode as a single byte
         </xs:documentation>
      </xs:annotation>
      <xs:union>
         <xs:simpleType>
            <xs:restriction base="xs:unsignedInt">
               <xs:minInclusive value="0"/>
               <xs:maxInclusive value="255"/>
            </xs:restriction>
         </xs:simpleType>
         <xs:simpleType>
            <xs:restriction base="xs:string">
               <xs:enumeration value="useInstantlyOnly"/>
               <xs:enumeration value="useFor3meters"/>
               <xs:enumeration value="useFor10meters"/>