| 123456789101112131415161718192021222324252627282930313233343536373839 | 
							- <?xml version="1.0" encoding="ISO-8859-1"?>
 
- <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
-   <xs:element name="family" type="family_type">
 
-       <xs:key name="sibling_key">
 
-         <xs:selector xpath="siblings/sibling"/>
 
-         <xs:field xpath="@name"/>
 
-       </xs:key>
 
-       <xs:keyref name="sibling_key_ref" refer="sibling_key">
 
-         <xs:selector xpath="sisters/sister"/>
 
-         <xs:field xpath="@name"/>
 
-     </xs:keyref>
 
-   </xs:element>
 
-     <xs:complexType name="family_type">
 
-       <xs:sequence>
 
-         <xs:element name="siblings" type="siblings_type" />
 
-         <xs:element name="sisters" type="sisters_type"  />
 
-       </xs:sequence>
 
-       <xs:attribute name="name" type="xs:string"/>
 
-     </xs:complexType>
 
-     <xs:complexType name="siblings_type">
 
-       <xs:sequence>
 
-         <xs:element name="sibling" type="sibling_type" minOccurs="0"  
 
- maxOccurs="unbounded" />
 
-       </xs:sequence>
 
-     </xs:complexType>    
 
-     <xs:complexType name="sisters_type">
 
-       <xs:sequence>
 
-         <xs:element name="sister" type="sister_type" minOccurs="0"  
 
- maxOccurs="unbounded" />
 
-       </xs:sequence>
 
-     </xs:complexType>        
 
- 	<xs:complexType name="sibling_type">
 
- 		<xs:attribute name="name" type="xs:string"/>
 
- 	</xs:complexType>
 
- 	<xs:complexType name="sister_type">
 
- 		<xs:attribute name="name" type="xs:string"/>
 
- 	</xs:complexType>    
 
- </xs:schema>
 
 
  |