<!ELEMENT doc (para)* >
<!ATTLIST doc
   xmlns:xlink   CDATA       #FIXED "http://www.w3.org/1999/xlink"
   xml:lang      CDATA       #IMPLIED

<!ELEMENT ref ANY >
<!ATTLIST ref
   xmlns:xlink   CDATA       #FIXED "http://www.w3.org/1999/xlink"
   xlink:type    (simple)    #FIXED "simple"
   xlink:href    CDATA       #IMPLIED
   xlink:title   CDATA       #IMPLIED
   xlink:arcrole CDATA       #IMPLIED
   xlink:role    CDATA       #FIXED "http://www.company.com/reflink.xml"
   xlink:actuate (replace)   #FIXED "replace"
   xlink:show    (onRequest) #FIXED "onRequest" >

<!ELEMENT para #PCDATA | ref >
<!ATTLIST para
   xml:lang      CDATA       #IMPLIED >