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SAE J2735-Draft-Rev15 [issued: 01-30-07]
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42 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
6.18 Data Frame: DF_SpeedandHeadingConfidence
Use: A single byte long data frame combining multiple related bit fields into one byte.
ASN.1 Representation:
SpeedandHeadingConfidence ::= SEQUENCE {
heading HeadingConfidence, -- 3 bits
speed SpeedConfidence, -- 3 bits
throttle ThrottleConfidence -- 2 bits
}
XML Representation:
<xs:complexType name="SpeedandHeadingConfidence" >
<xs:sequence>
<xs:element name="heading" type="HeadingConfidence" />
<!-- 3 bits -->
<!-- 3 bits -->
<xs:element name="throttle" type="ThrottleConfidence" />
<!-- 2 bits -->
</xs:sequence>
</xs:complexType>
Used by: This entry is directly used by the following 4 other data structures in this standard (record type, descriptive name,
ASN.1, and XML name (if present) of each):
DF
DF
DF
DF
In addition, this item may be used by data structures in other ITS standards.
6.19 Data Frame: DF_Tail
Use: This data structure is a way to add pairs of names and associated values to a message. It typically appears
at the end of a message (hence the name "tail"). The value carried in this portion of the message shall not be
used to circumvent the structure of the messages. That said, this is an excellent way to add further meta-data to
a message or to add content which a local deployment feels is needed but, which is not currently in the message
set.
ASN.1 Representation:
Tail ::= SEQUENCE
{
entries SEQUENCE (SIZE (1..32)) OF SEQUENCE {
tag UTF8String (SIZE(1..20)),
value UTF8String (SIZE(1..200))
}
-- sets of addtional named data values
}
XML Representation:
<xs:complexType name="Tail">
<xs:sequence maxOccurs="32">
<xs:element name="entry">
<xs:complexType>
<xs:sequence>
<xs:element name="tag">
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:minLength value="1"/>
<xs:maxLength value="20"/>