<xs:attribute name="outlinetype" default="solid" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="solid" />
      <xs:enumeration value="dash" />
      <xs:enumeration value="null" />
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>