DTD for Extended Links
<!ELEMENT WEBSITE (NAME, HOMESITE, MIRROR*) >
<!ATTLIST WEBSITE
xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink"
xlink:type (extended) #FIXED "extended"
xlink:title CDATA #IMPLIED
xlink:role CDATA #IMPLIED
>
<!ELEMENT NAME (#PCDATA)>
<!ATTLIST NAME
xlink:type (resource) #FIXED "resource"
xlink:role CDATA #IMPLIED
xlink:title CDATA #IMPLIED
>
<!ELEMENT HOMESITE (#PCDATA)>
<!ATTLIST HOMESITE
xlink:type (locator) #FIXED "locator"
xlink:href CDATA #REQUIRED
xlink:role CDATA #IMPLIED
xlink:title CDATA #IMPLIED
>
<!ELEMENT MIRROR (#PCDATA)>
<!ATTLIST MIRROR
xlink:type (locator) #FIXED "locator"
xlink:href CDATA #REQUIRED
xlink:role CDATA #IMPLIED
xlink:title CDATA #IMPLIED
>