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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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122 -
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: This data element appears as the first optional element it the Pat II section of the BSM, and is
expected to be present when various potential dangerous events (such as hard breaking) have been declared
by the sender. Additional data elements in the message may provide more detail on the cause of this event.
7.45 Data Element: DE_Extent
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),
useFor10000meters (8),
useFor50000meters (9),
useFor100000meters (10),
forever (127) -- 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)
useFor10000meters (8)
useFor50000meters (9)
useFor100000meters (10)
forever (127) -- 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="127"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="useInstantlyOnly"/>
<xs:enumeration value="useFor3meters"/>