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Define prefixes in the schema for both our target namespace and for the W3C XML Schema namespace

File: Data.xml <?xml version="1.0"?> <library xmlns="http://rntsoft.com/ns/library">   <book id="b0836217462" available="yes">     <isbn>0836217462</isbn>     <title>Java</title>     <authors>       <person id="CMS">         <name>name 1</name>         <born>1956-11-26</born>         <dead>2000-02-12</dead>       </person>     </authors>     <characters>       <person id="PP">         <name>Swing</name>         <born>1966-08-22</born>         <qualification>GUI</qualification>       </person>       <person id="Snoopy">         <name>Database</name>         <born>1950-10-04</born>         <qualification>JDBC</qualification>       </person>     </characters>   </book> </library> File: Schema.xsd <?xml version="1.0"?> <xs:schema targetNamespace="http://rntsoft.com/ns/library"   elementFormDefault="qualified" attributeFormDefault="unqualified"   xmlns:lib="http://rntsoft.com/ns/library"   xmlns:xs="http://www.w3.org/2001/XMLSchema">   <xs:element name="library">     <xs:complexType>       <xs:sequence>         <xs:element name="book" type="lib:bookType" />       </xs:sequence>     </xs:complexType>   </xs:element>   <xs:element name="person">     <xs:complexType>       <xs:sequence>         <xs:element name="name" type="xs:string" />         <xs:element name="born" type="xs:date" />         <xs:element name="dead" type="xs:date" minOccurs="0" />         <xs:element name="qualification" type="xs:string"           minOccurs="0" />       </xs:sequence>       <xs:attribute name="id" type="xs:ID" use="required" />     </xs:complexType>   </xs:element>   <xs:complexType name="bookType">     <xs:sequence>       <xs:element name="isbn" type="xs:NMTOKEN" />       <xs:element name="title" type="xs:string" />       <xs:element name="authors">         <xs:complexType>           <xs:sequence>             <xs:element ref="lib:person"               maxOccurs="unbounded" />           </xs:sequence>         </xs:complexType>       </xs:element>       <xs:element name="characters">         <xs:complexType>           <xs:sequence>             <xs:element ref="lib:person"               maxOccurs="unbounded" />           </xs:sequence>         </xs:complexType>       </xs:element>     </xs:sequence>     <xs:attribute name="id" type="xs:ID" use="required" />     <xs:attribute name="available" type="xs:string" use="required" />   </xs:complexType> </xs:schema>