<xsd:schema xmls:xsd="http://www.w3.org/2001/XMLSchema"
	xmls:s='http://www.inria.fr/acacia'>

	<xsd:element name="book" type="s:bookType"/>

	<xsd:complexType name='bookType'>
    		<xsd:sequence>
			<xsd:element name='author' 	type='s:author'/>
			<xsd:element name='title'	type='string'/>
			<xsd:element name='publisher' 	type='string'/>
			<xsd:element name='year' 	type='integer'/> 
    		</xsd:sequence>

    		<xsd:attribute name='id'		type='string'/>
	</xsd:complexType>
<xsd:schema>

<s:book id='...'>
	<s:author>
		<s:name>J. M. Keynes</s:name>
	</s:author>
	<s:title>General Theory ...</s:title>
	<s:publisher>...</s:publisher>
	<s:year>...</s:year> 
<s:book>