<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:include schemaLocation="common-simple-types.xsd" />
    <xs:include schemaLocation="common-complex-types.xsd" />
    
    <xs:complexType name="book">
        <xs:all>
            <xs:element name="genre" type="genre" />
            <xs:element name="author" type="author" />
            <xs:element name="narrator" type="narrator" />
            <xs:element name="publisher" type="publisher" />
        </xs:all>
        <xs:attributeGroup ref="book" />
        <xs:attributeGroup ref="bookExtended" />
    </xs:complexType>
    
    <xs:complexType name="books">
        <xs:complexContent>
            <xs:extension base="list">
                <xs:sequence>
                    <xs:element name="book" type="book" minOccurs="0" maxOccurs="unbounded" />
                </xs:sequence>
            </xs:extension>
        </xs:complexContent>                    
    </xs:complexType>
    
    <xs:element name="response">
        <xs:complexType>
            <xs:sequence>
                <xs:group ref="response" />
                <xs:group ref="search" minOccurs="0" />
                <xs:element name="books" type="books" minOccurs="0" />
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>
