<!ELEMENT arcElement EMPTY>
<!ATTLIST arcElement
  xlink:type    (arc)                #FIXED "arc"
  xlink:role     NMTOKEN               #IMPLIED
  xlink:title    CDATA                 #IMPLIED
  xlink:show    (new
                |replace
                |embed
                |undefined)          #IMPLIED
  xlink:actuate (onLoad
                |onRequest
                |undefined)          #IMPLIED >
  xlink:from    NMTOKEN                #IMPLIED
  xlink:to      NMTOKEN                #IMPLIED