<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
	<xs:attributeGroup name="attrGroup">
		<xs:attribute name="attrTest1"/>
		<xs:attribute name="attrTest2"/>
	</xs:attributeGroup>
	<xs:attributeGroup name="attrGroup2">
		<xs:attribute name="attrTest3"/>
		<xs:attribute name="attrTest4"/>
	</xs:attributeGroup>
	<xs:complexType name="fooType">
		<xs:attributeGroup ref="attrGroup"/>
		<xs:attributeGroup ref="attrGroup2"/>
	</xs:complexType>
	<xs:element name="root" type="fooType"/>
</xs:schema>