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SAE J2735-Draft-Rev18 [issued: 06-26-07] 
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This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
XML Representation:
<xs:element name="alaCarte" type="AlaCarte"/>
<xs:complexType name="AlaCarte" >
      <xs:sequence>
         <!-- each send as required with short tags -->
         <xs:element name="valueCnt1" >
            <xs:simpleType>
               <xs:restriction base="xs:unsignedByte">
                  <xs:maxInclusive value="32"/>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
         <xs:element name="items1" >
            <xs:complexType>
               <xs:sequence minOccurs="0" maxOccurs="32">
                  <xs:element name="items1-item" >
                     <xs:complexType>
                        <xs:sequence>
                           <xs:element name="tag" type="StdTagList" />
                           <xs:element name="value" type="ValueList" />
                        </xs:sequence>
                     </xs:complexType>
                  </xs:element>
                  <!-- Part II,  the ad hoc data section -->
               </xs:sequence>
            </xs:complexType>
         </xs:element>
         <xs:element name="valueCnt2" >
            <xs:simpleType>
               <xs:restriction base="xs:unsignedByte">
                  <xs:maxInclusive value="32"/>
               </xs:restriction>
            </xs:simpleType>
         </xs:element>
         <xs:element name="items2" >
            <xs:complexType>
               <xs:sequence minOccurs="0" maxOccurs="32">
                  <xs:element name="items2-item" >
                     <xs:complexType>
                        <xs:sequence>
                           <xs:element name="tag" type="TwoByteTagList" />
                           <xs:element name="data" >
                              <xs:complexType>
                                 <xs:choice>
                                    <xs:element name="payload" type="Payload" />
                                    <xs:element name="value" type="ValueList" />
                                 </xs:choice>
                              </xs:complexType>
                           </xs:element>
                        </xs:sequence>
                     </xs:complexType>
                  </xs:element>
               </xs:sequence>
            </xs:complexType>
         </xs:element>
         <xs:element name="localAlaCarte" type="local:AlaCarte" minOccurs="0"/>
      </xs:sequence>
</xs:complexType>
5.2 Message: MSG_BasicSafetyMessage
Use: The basic safety message is defined here.  This message is used in a variety of applications to
exchange safety data regarding vehicle state.  This message is broadcast to surrounding vehicles
periodically with a variety of data content as required by different applications.  Certain data is sent with
every instance of the message.  Other information is sent periodically or selectively based on the requests
of other nearby vehicles.  Refer to each safety application for specific details.