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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.
MSG
<XML>, and
DF 
In addition, this item may be used by data structures in other ITS standards.
Remarks: Most of these values are used to detect that the transit vehicle in not in a state where movement
can occur (and that therefore any priority signal should be be ignored until the vehicle is again ready to
depart).  Two bits (bits x and y) are used to relate the relative occupancy of the vehicle.  
7.139 Data Element: DE_TransitPreEmptionRequest
Use: The TransitPreEmptionRequest data element will be used to enumerate various type of preemption
events.  
ASN.1 Representation:
TransitPreEmptionRequest ::= ENUMERATED {
     itemOne       (0), 
     itemTwo       (1), -- add any comments here
     itemThree     (2), 
     itemFour      (3),
     ... -- # LOCAL_CONTENT
     } 
     -- values to 127 reserved for std use
     -- values 128 to 255 reserved for local use
XML Representation:
<xs:simpleType name="TransitPreEmptionRequest" >
      <xs:annotation>
         <xs:appinfo>
            itemOne (0)
            itemTwo (1) -- add any comments here
            itemThree (2)
            itemFour (3)
         </xs:appinfo>
         <xs:documentation>       
            values to 127 reserved for std use
            values 128 to 255 reserved for local use
         </xs:documentation>
      </xs:annotation>
      <xs:union>
         <xs:simpleType>
            <xs:restriction base="xs:unsignedInt">
               <xs:minInclusive value="0"/>
               <xs:maxInclusive value="3"/>
            </xs:restriction>
         </xs:simpleType>
         <xs:simpleType>
            <xs:restriction base="xs:string">
               <xs:enumeration value="itemOne"/>
               <xs:enumeration value="itemTwo"/>
               <xs:enumeration value="itemThree"/>
               <xs:enumeration value="itemFour"/>
            </xs:restriction>
         </xs:simpleType >
         <xs:simpleType>
            <xs:restriction base="local:TransitPreEmptionRequest" /> 
         </xs:simpleType>
      </xs:union>
</xs:simpleType>
In addition, this item may be used by data structures in other ITS standards.