<xs:element name="RoughnessAverageValue" type="MeasuredLinearValueType" minOccurs="0"><xs:annotation><xs:documentation>The optional RoughnessAverage element is the measured Roughness Average (Ra) value.</xs:documentation></xs:annotation></xs:element>
The id attribute is the QIF id of the characteristic, used for referencing.
Source
<xs:complexType name="SurfaceTextureCharacteristicMeasurementType"><xs:annotation><xs:documentation>The SurfaceTextureCharacteristicMeasurementType defines the results of a measured surface texture characteristic evaluation.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="CharacteristicMeasurementBaseType"><xs:sequence><xs:element name="RoughnessAverageValue" type="MeasuredLinearValueType" minOccurs="0"><xs:annotation><xs:documentation>The optional RoughnessAverage element is the measured Roughness Average (Ra) value.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:extension></xs:complexContent></xs:complexType>