<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

	<xs:simpleType name="string255">

		<xs:restriction base="xs:token">

			<xs:maxLength value="255"/>

		</xs:restriction>

	</xs:simpleType>

	<xs:simpleType name="string32">

		<xs:restriction base="xs:token">

			<xs:maxLength value="32"/>

		</xs:restriction>

	</xs:simpleType>

	<xs:simpleType name="isbn">

		<xs:restriction base="xs:unsignedLong">

			<xs:totalDigits value="10"/>

		</xs:restriction>

	</xs:simpleType>

	<xs:simpleType name="supportedLanguages">

		<xs:restriction base="xs:language">

			<xs:enumeration value="en"/>

			<xs:enumeration value="es"/>

		</xs:restriction>

	</xs:simpleType>

	<xs:element name="name" type="string32"/>

	<xs:element name="qualification" type="string255"/>

	<xs:element name="born" type="xs:date"/>

	<xs:element name="dead" type="xs:date"/>

	<xs:element name="isbn" type="isbn"/>

	<xs:attribute name="id" type="xs:ID"/>

	<xs:attribute name="available" type="xs:boolean"/>

	<xs:attribute name="lang" type="supportedLanguages"/>

	<xs:element name="title">

		<xs:complexType>

			<xs:simpleContent>

				<xs:extension base="string255">

					<xs:attribute ref="lang"/>

				</xs:extension>

			</xs:simpleContent>

		</xs:complexType>

	</xs:element>

	<xs:element name="library">

		<xs:complexType>

			<xs:sequence>

				<xs:element ref="book" maxOccurs="unbounded"/>

			</xs:sequence>

		</xs:complexType>

	</xs:element>

	<xs:element name="author">

		<xs:complexType>

			<xs:sequence>

				<xs:element ref="name"/>

				<xs:element ref="born"/>

				<xs:element ref="dead" minOccurs="0"/>

			</xs:sequence>

			<xs:attribute ref="id"/>

		</xs:complexType>

	</xs:element>

	<xs:element name="book">

		<xs:complexType>

			<xs:sequence>

				<xs:element ref="isbn"/>

				<xs:element ref="title"/>

				<xs:element ref="author" minOccurs="0" maxOccurs="unbounded"/>

				<xs:element ref="character" minOccurs="0" maxOccurs="unbounded"/>

			</xs:sequence>

			<xs:attribute ref="id"/>

			<xs:attribute ref="available"/>

		</xs:complexType>

	</xs:element>

	<xs:element name="character">

		<xs:complexType>

			<xs:sequence>

				<xs:element ref="name"/>

				<xs:element ref="born"/>

				<xs:element ref="qualification"/>

			</xs:sequence>

			<xs:attribute ref="id"/>

		</xs:complexType>

	</xs:element>

</xs:schema>