<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<!-- define a complex type called 'hue'-->
	<xs:complexType name="hue">
		<!-- define allowable elements as all -->
		<xs:all>
			<xs:element name="red" type="xs:string"/>
			<xs:element name="green" type="xs:string"/>
			<xs:element name="blue" type="xs:string"/>
		</xs:all>
	</xs:complexType>
	<!-- declare element of the 'hue' type -->
	<xs:element name="colour" type="hue"/>
</xs:schema>