Validation Problems with extension

[Abhideep Singh]

I have defined a complexType called ShapeCollection which containes an
unbounded number of shapeElements of the type shapeType in the file
shape.xsd

shapeType is extended by type circleType defined in circle.xsd

The XML file with just one CircleType (shapeTest1.xml) validates fine. But
the XML file with with more than one CircleType fails validation. Am I doing
something wrong or is this a bug with teh Parser.

Thanks a lot
Abhideep

============= shape.xsd ====================
<?xml version="1.0"?>
<xsd:schema
targetNamespace="http://www.xyz.com/schemas/2001/02/shapeCollectionType";
        xmlns:xsd="http://www.w3.org/2001/XMLSchema";
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
        xmlns:xyz="http://www.xyz.com/schemas/2001/02/shapeCollectionType";>

   <xsd:element name="shapeCollection" type="xyz:shapeCollectionType" />
   
   <xsd:complexType name="shapeCollectionType">
        <xsd:sequence>                
          <xsd:element name="shapeCollectionName" type="xsd:string"
minOccurs="1" maxOccurs="1"/>
          <xsd:element name="shapeElement" type="xyz:shapeType"
minOccurs="1" maxOccurs="unbounded"/>
        </xsd:sequence>
   </xsd:complexType>

   <xsd:complexType name="shapeType">
        <xsd:sequence>                
          <xsd:element name="shapeName" type="xsd:string" minOccurs="1"
maxOccurs="1"/>
        </xsd:sequence>
   </xsd:complexType>
</xsd:schema>

============= circle.xsd ====================
<?xml version="1.0"?>
<xsd:schema targetNamespace="http://www.xyz.com/schemas/2001/02/circleType";
        xmlns:xsd="http://www.w3.org/2001/XMLSchema";
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
        xmlns:circle="http://www.zaplet.com/schemas/2001/02/circleType";
        xmlns:xyz="http://www.xyz.com/schemas/2001/02/shapeCollectionType";>
            
   <xsd:import
namespace="http://www.xyz.com/schemas/2001/02/shapeCollectionType";
schemaLocation="shape.xsd"/>
    
   <xsd:complexType name="circleType">
       <xsd:complexContent>
           <xsd:extension base="xyz:shapeType">
               <xsd:sequence>
                   <xsd:element name="radius" type="xsd:integer"
minOccurs="1" maxOccurs="1"/>
                   <xsd:element name="xCoordinate" type="xsd:string"
minOccurs="1" maxOccurs="1" />
                   <xsd:element name="yCoordinate" type="xsd:string"
minOccurs="1" maxOccurs="1" />
                   <xsd:element name="zCoordinate" type="xsd:string"
minOccurs="1" maxOccurs="1" />
               </xsd:sequence>
           </xsd:extension>
       </xsd:complexContent>
   </xsd:complexType>
</xsd:schema>

============= shapeTest1.xml ====================
<?xml version="1.0"?>
<xyz:shapeCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xmlns:xyz="http://www.xyz.com/schemas/2001/02/shapeCollectionType";
 
xsi:schemaLocation="http://www.xyz.com/schemas/2001/02/shapeCollectionType
shape.xsd">
    
        <shapeCollectionName>CircleCollection</shapeCollectionName>
        <shapeElement
xmlns:circle="http://www.xyz.com/schemas/2001/02/circleType";
        
xsi:schemaLocation="http://www.xyz.com/schemas/2001/02/circleType
circle.xsd"
                xsi:type="circle:circleType">
                        <shapeName>Sphere</shapeName>
                        <radius>3</radius>
                        <xCoordinate>1</xCoordinate>
                        <yCoordinate>1</yCoordinate>
                        <zCoordinate>1</zCoordinate>
        </shapeElement>
</xyz:shapeCollection>


============= shapeTest2.xml ====================
<?xml version="1.0"?>
<xyz:shapeCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
    xmlns:xyz="http://www.xyz.com/schemas/2001/02/shapeCollectionType";
 
xsi:schemaLocation="http://www.xyz.com/schemas/2001/02/shapeCollectionType
shape.xsd">
        <shapeCollectionName>CircleCollection</shapeCollectionName>
        <shapeElement
xmlns:circle="http://www.xyz.com/schemas/2001/02/circleType";
        
xsi:schemaLocation="http://www.xyz.com/schemas/2001/02/circleType
circle.xsd"
                xsi:type="circle:circleType">
                        <shapeName>Circle</shapeName>
                        <radius>3</radius>
                        <xCoordinate>1</xCoordinate>
                        <yCoordinate>1</yCoordinate>
                        <zCoordinate>1</zCoordinate>
        </shapeElement>
        <shapeElement
xmlns:circle="http://www.xyz.com/schemas/2001/02/circleType";
        
xsi:schemaLocation="http://www.xyz.com/schemas/2001/02/circleType
circle.xsd"
                xsi:type="circle:circleType">
                        <shapeName>Circle</shapeName>
                        <radius>3</radius>
                        <xCoordinate>1</xCoordinate>
                        <yCoordinate>1</yCoordinate>
                        <zCoordinate>1</zCoordinate>
        </shapeElement>
</xyz:shapeCollection>

============= Exceptions ====================
[Error] shapeTest2.xml:17:32: General Schema Error: Type :
http://www.xyz.com/schemas/2001/02/circleType,circleType does not derive
from the type of element zCo
ordinate.
Exception in thread "main" org.xml.sax.SAXParseException: General Schema
Error:
Type : http://www.xyz.com/schemas/2001/02/circleType,circleType does not
derive
from the type of element zCoordinate.

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