<xs:element name="RoughnessAverage" type="LinearValueType"><xs:annotation><xs:documentation>The RoughnessAverage element is the ASME Y14.36 - 1978 Roughness Average (Ra) value of the surface texture.</xs:documentation></xs:annotation></xs:element>
The id attribute is the QIF id of the characteristic, used for referencing.
Source
<xs:complexType name="SurfaceTextureCharacteristicDefinitionType"><xs:annotation><xs:documentation>The SurfaceTextureCharacteristicDefinitionType defines information that can be common to more than one surface texture characteristic.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="CharacteristicDefinitionBaseType"><xs:sequence><xs:element name="RoughnessAverage" type="LinearValueType"><xs:annotation><xs:documentation>The RoughnessAverage element is the ASME Y14.36 - 1978 Roughness Average (Ra) value of the surface texture.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:extension></xs:complexContent></xs:complexType>