The optional speedUnit attribute defines the unit name for the SummaryStatisticsSpeedType.
Source
<xs:complexType name="SummaryStatisticsSpeedType"><xs:annotation><xs:documentation>The SummaryStatisticsSpeedType defines a summary of a single speed statistical value.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="SummaryStatisticsType"><xs:attribute name="speedUnit" type="xs:token"><xs:annotation><xs:documentation>The optional speedUnit attribute defines the unit name for the SummaryStatisticsSpeedType.</xs:documentation></xs:annotation></xs:attribute></xs:extension></xs:complexContent></xs:complexType>
<xs:attribute name="speedUnit" type="xs:token"><xs:annotation><xs:documentation>The optional speedUnit attribute defines the unit name for the SummaryStatisticsSpeedType.</xs:documentation></xs:annotation></xs:attribute>