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SAE J2735-Draft-Rev26 [issued: 09-18-08] 
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159 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
               <xs:enumeration value="stop"/>
               <xs:enumeration value="caution"/>
               <xs:enumeration value="walk"/>
               <xs:enumeration value="othersHere"/>
            </xs:restriction>
         </xs:simpleType >
      </xs:union>
</xs:simpleType>
Used By: This entry is used directly by one other data structure in this standard, a DF called
DF_MovementState <ASN> <XML>.   In addition, this item may be used by data structures in other
ITS standards.
7.103 Data Element: DE_PositionalAccuracy
Use: The DE_ Positional Accuracy element is a 4 byte octet of packed data consisting of various
parameters of quality used to model the accuracy of the positional determination with respect of a each
given axis.  Note that because the 3 data elements are packed as one single data object, this is treated as a
data element not a data frame.  
ASN.1 Representation:
PositionalAccuracy ::= OCTET STRING (SIZE(4)) 
  -- And the bytes defined as folllows
  -- Byte 1: semi-major accuracy at one standard dev 
  -- (signed range 0-12.7 meter. 0xFF=any value equal
  -- or greater than 12.7 meter)
  -- Byte 2: semi-minor accuracy at one standard dev 
  -- (signed range 0-12.7 meter. 0xFF=any value equal 
  -- or greater than 12.7 meter)
  -- Bytes 3-4: orientation of semi-major axis 
  -- relative to true north (0-360 degree) 
  -- (In NMEA GPGST)
XML Representation:
<xs:complexType name="PositionalAccuracy" >
   <xs:simpleContent>
      <xs:annotation>
         <xs:documentation>       
            And the bytes defined as folllows
            Byte 1: semi-major accuracy at one standard dev
            (signed range 0-12.7 meter. 0xFF=any value equal
            or greater than 12.7 meter)
            Byte 2: semi-minor accuracy at one standard dev
            (signed range 0-12.7 meter. 0xFF=any value equal
            or greater than 12.7 meter)
            Bytes 3-4: orientation of semi-major axis
            relative to true north  (0-360 degree)
            (In NMEA GPGST)
         </xs:documentation>
      </xs:annotation>
      <xs:extension base="PositionalAccuracy-string" >
         <xs:attribute name="EncodingType" use="required">
           <xs:simpleType>
              <xs:restriction base="xs:NMTOKEN">
                 <xs:enumeration value="base64Binary"/>
              </xs:restriction>
           </xs:simpleType>
         </xs:attribute>
      </xs:extension>
   </xs:simpleContent>
</xs:complexType>
<xs:simpleType name="PositionalAccuracy-string">
   <xs:restriction base="xs:base64Binary">
      <xs:length value="6"/>
   </xs:restriction>
</xs:simpleType >
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