<xs:element name="CoordinateMethod" type="PositionCoordinateMethodType" minOccurs="0"><xs:annotation><xs:documentation>The optional CoordinateMethod element defines the coordinate method for bidirectional positional tolerancing.</xs:documentation></xs:annotation></xs:element>
The id attribute is the QIF id of the characteristic, used for referencing.
Source
<xs:complexType name="PositionCharacteristicNominalType"><xs:annotation><xs:documentation>The PositionCharacteristicNominalType defines a unique position characteristic nominal.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="LocationCharacteristicNominalBaseType"><xs:sequence><xs:element name="CoordinateMethod" type="PositionCoordinateMethodType" minOccurs="0"><xs:annotation><xs:documentation>The optional CoordinateMethod element defines the coordinate method for bidirectional positional tolerancing.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:extension></xs:complexContent></xs:complexType>