<?xml version=“1.0”?> <xs:schema xmlns:xs=“www.w3.org/2001/XMLSchema”>

<xs:complexType name="length1">
  <xs:simpleContent>
    <xs:extension base="xs:nonNegativeInteger">
      <xs:attribute name="unit" type="xs:NMTOKEN"/>
    </xs:extension>
  </xs:simpleContent>
</xs:complexType>
<xs:element name="width" type="length1"/>

</xs:schema>