<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xs:group name="product">
		<xs:sequence>
			<xs:choice>
				<xs:element name="product-code" type="xs:string"/>
				<xs:element name="stock-number" type="xs:string"/>
			</xs:choice>
			<xs:element name="price" type="xs:decimal"/>
		</xs:sequence>
	</xs:group>
	<xs:complexType name="general">
		<xs:sequence>
			<xs:element name="name" type="xs:string"/>
			<xs:group ref="product"/>
		</xs:sequence>
	</xs:complexType>
	<xs:complexType name="audio">
		<xs:sequence>
			<xs:element name="title" type="xs:string"/>
			<xs:element name="artist" type="xs:string"/>
			<xs:group ref="product"/>
		</xs:sequence>
	</xs:complexType>
	<xs:element name="stock">
		<xs:complexType>
			<xs:sequence>
				<xs:element name="toy" type="general"/>
				<xs:element name="cd" type="audio"/>
			</xs:sequence>
		</xs:complexType>
	</xs:element>
</xs:schema>