test/schemas/length1_0.xsd

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://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>