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