Book.xsd

<?xml version="1.0"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
        	targetNamespace="https://www.xmlunit.org/publishing"
			xmlns="https://www.xmlunit.org/publishing"
			version="1.0"
        	elementFormDefault="qualified">
	
	<xsd:element name="Book" type="BookType"/>

    <xsd:complexType name="BookType">
        <xsd:sequence>
            <xsd:element name="Title" type="xsd:string" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="Author" type="xsd:string" minOccurs="1" maxOccurs="unbounded"/>
            <xsd:element name="Date" type="xsd:string" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="ISBN" type="xsd:string" minOccurs="1" maxOccurs="1"/>
            <xsd:element name="Publisher" type="xsd:string" minOccurs="1" maxOccurs="1"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:schema>