<!– 3.2.3 : 3.2

If ref is present, then all of <simpleType>, form and type must be absent
This one tests <simpleType>

–> <schema xmlns=“www.w3.org/2001/XMLSchema” targetNamespace=“foo” xmlns:foo=“foo”>

<element name="foo">
        <complexType>
              <attribute ref="foo:bar">
                      <simpleType>
                              <restriction base="string">
                                      <maxLength value="20"/>
                              </restriction>
                      </simpleType>
              </attribute>
        </complexType>    
</element>  

<attribute name="bar" type="string" />

</schema>