<BaseFeature xmlns="http://qifstandards.org/xsd/qif3">
  <ReferencedComponent>{1,1}</ReferencedComponent>
  <FeatureId asmPathId="" asmPathXId="" xId="">{1,1}</FeatureId>
  <SequenceNumber>{1,1}</SequenceNumber>
</BaseFeature>

<xs:element name="BaseFeature" type="SequencedBaseFeatureType" minOccurs="4" maxOccurs="unbounded">
  <xs:annotation>
    <xs:documentation>Each BaseFeature element identifies a base feature to be used for the construction of a sphere. The number of base features must be 4 or greater.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="SphereBestFitType">
  <xs:annotation>
    <xs:documentation>The SphereBestFitType defines the information for a best-fit sphere which includes a list of point-reducible base features; the points to which those features reduce are used in the best-fit construction of the sphere.</xs:documentation>
  </xs:annotation>
  <xs:complexContent>
    <xs:extension base="ConstructionMethodBaseType">
      <xs:sequence>
        <xs:element name="BaseFeature" type="SequencedBaseFeatureType" minOccurs="4" maxOccurs="unbounded">
          <xs:annotation>
            <xs:documentation>Each BaseFeature element identifies a base feature to be used for the construction of a sphere. The number of base features must be 4 or greater.</xs:documentation>
          </xs:annotation>
        </xs:element>
      </xs:sequence>
      <xs:attribute name="n" type="NaturalType" use="required">
        <xs:annotation>
          <xs:documentation>The required n attribute is the number of base features used in the construction.</xs:documentation>
        </xs:annotation>
      </xs:attribute>
    </xs:extension>
  </xs:complexContent>
</xs:complexType>

<xs:attribute name="n" type="NaturalType" use="required">
  <xs:annotation>
    <xs:documentation>The required n attribute is the number of base features used in the construction.</xs:documentation>
  </xs:annotation>
</xs:attribute>