pages referer to the previous version
replace on page: 257 in the XML Model Box
Section of the Standard:  2.5.4  
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<xsd:group name="AddressReferenceSystemExtentGroup">
	<xsd:sequence>
		<xsd:element name="AddressReferenceSystemExtent">
			<xsd:complexType>
				<xsd:sequence>
					<xsd:element ref="gml:MultiSurface"/>
				</xsd:sequence>
			</xsd:complexType>
		</xsd:element>
	</xsd:sequence>
</xsd:group>