The CenterLine element is the nominal location point and a unit vector direction of the centerline of the elongated circle feature. The location point is both midway between the sides and between the ends. Or in other words, the sides are located half the diameter away from the location point in directions perpendicular to both the centerline vector and the normal vector. The ends are located half the length away from the location point in directions along and against the centerline vector.
<xs:element name="CenterLine" type="PointAndVectorType"><xs:annotation><xs:documentation>The CenterLine element is the nominal location point and a unit vector direction of the centerline of the elongated circle feature. The location point is both midway between the sides and between the ends. Or in other words, the sides are located half the diameter away from the location point in directions perpendicular to both the centerline vector and the normal vector. The ends are located half the length away from the location point in directions along and against the centerline vector.</xs:documentation></xs:annotation></xs:element>
The Normal element is the nominal unit normal vector of the plane in which the elongated circle feature lies. The Normal must be perpendicular to the center line.
<xs:element name="Normal" type="UnitVectorType"><xs:annotation><xs:documentation>The Normal element is the nominal unit normal vector of the plane in which the elongated circle feature lies. The Normal must be perpendicular to the center line.</xs:documentation></xs:annotation></xs:element>
<xs:element name="Constructed" type="ElongatedCircleConstructionMethodType" minOccurs="0"><xs:annotation><xs:documentation>The optional Constructed element signifies that the elongated circle is constructed and provides details of the construction method.</xs:documentation></xs:annotation></xs:element>
The id attribute is the QIF id of the feature, used for referencing.
Source
<xs:complexType name="ElongatedCircleFeatureNominalType"><xs:annotation><xs:documentation>The ElongatedCircleFeatureNominalType defines the elongated circle feature nominal information for an individual elongated circle feature.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="CurveFeatureNominalBaseType"><xs:sequence><xs:element name="CenterLine" type="PointAndVectorType"><xs:annotation><xs:documentation>The CenterLine element is the nominal location point and a unit vector direction of the centerline of the elongated circle feature. The location point is both midway between the sides and between the ends. Or in other words, the sides are located half the diameter away from the location point in directions perpendicular to both the centerline vector and the normal vector. The ends are located half the length away from the location point in directions along and against the centerline vector.</xs:documentation></xs:annotation></xs:element><xs:element name="Normal" type="UnitVectorType"><xs:annotation><xs:documentation>The Normal element is the nominal unit normal vector of the plane in which the elongated circle feature lies. The Normal must be perpendicular to the center line.</xs:documentation></xs:annotation></xs:element><xs:element name="Constructed" type="ElongatedCircleConstructionMethodType" minOccurs="0"><xs:annotation><xs:documentation>The optional Constructed element signifies that the elongated circle is constructed and provides details of the construction method.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:extension></xs:complexContent></xs:complexType>