<xs:schema 
        targetNamespace="http://www.w3.org/1999/xlink" 

        xmlns:xlink="http://www.w3.org/1999/xlink" 
        xmlns:xs="http://www.w3.org/2001/XMLSchema"

        elementFormDefault="qualified"
        attributeFormDefault="unqualified"
>

<xs:attribute name="type" default="simple">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="simple"/>
      <xs:enumeration value="extended"/>
      <xs:enumeration value="locator"/>
      <xs:enumeration value="arc"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>

<xs:attribute name="href" type="xs:anyURI" />

<xs:attribute name="role" type="xs:string" />

<xs:attribute name="arcrole" type="xs:string" />

<xs:attribute name="title" type="xs:string" />

<xs:attribute name="show" default="embed">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="new"/>
      <xs:enumeration value="replace"/>
      <xs:enumeration value="embed"/>
      <xs:enumeration value="other"/>
      <xs:enumeration value="none"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>

<xs:attribute name="actuate" default="onLoad">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="onLoad"/>
      <xs:enumeration value="onRequest"/>
      <xs:enumeration value="other"/>
      <xs:enumeration value="none"/>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>

<xs:attribute name="from" type="xs:string" />

<xs:attribute name="to" type="xs:string" />

</xs:schema>

• actuate
• arcrole
• from
• href
• role
• show
• title
• to
• type