<xs:element name="Circle" type="CircleType"><xs:annotation><xs:documentation>The Circle element is the circle that defines the basic size and location of a circular line.</xs:documentation></xs:annotation></xs:element>
The id attribute is the QIF id of the feature zone, used for referencing.
Source
<xs:complexType name="FeatureZoneCurveCircularType"><xs:annotation><xs:documentation>The FeatureZoneCurveCircularType defines a feature zone as a circle or an arc.</xs:documentation></xs:annotation><xs:complexContent><xs:extension base="FeatureZoneCurveBaseType"><xs:sequence><xs:element name="Circle" type="CircleType"><xs:annotation><xs:documentation>The Circle element is the circle that defines the basic size and location of a circular line.</xs:documentation></xs:annotation></xs:element></xs:sequence></xs:extension></xs:complexContent></xs:complexType>