<xsd:complexType name="areaType">
<xsd:choice>
<xsd:element minOccurs="1" maxOccurs="1" name="circle" type="circleType" />
<xsd:element minOccurs="1" maxOccurs="1" name="rectangle" type="rectangleType" />
</xsd:choice>
<xsd:attribute name="area-type" use="optional">
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="circle" />
<xsd:enumeration value="rectangle" />
</xsd:restriction>
</xsd:simpleType>
</xsd:attribute>
</xsd:complexType>
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