Document Type Definition (DTD)

<!ELEMENT SONG (TITLE, PHOTO?, COMPOSER+, PRODUCER*, 
 PUBLISHER*, LENGTH?, YEAR?, ARTIST+)>

<!ELEMENT TITLE     (#PCDATA)>
<!ELEMENT COMPOSER  (#PCDATA)>
<!ELEMENT PRODUCER  (#PCDATA)>
<!ELEMENT PUBLISHER (#PCDATA)>
<!ELEMENT LENGTH    (#PCDATA)>
<!-- This should be a four digit year like "1999",
     not a two-digit year like "99" -->
<!ELEMENT YEAR   (#PCDATA)>
<!ELEMENT ARTIST (#PCDATA)>
<!ELEMENT PHOTO EMPTY>
<!ATTLIST PHOTO xlink:type (simple) #FIXED "simple" 
                xlink:show (onLoad) #FIXED "onLoad" 
                xlink:href CDATA #REQUIRED
                ALT CDATA #REQUIRED
                WIDTH NMTOKEN #REQUIRED
                HEIGHT NMTOKEN #REQUIRED
>
<!ATTLIST PUBLISHER xlink:type (simple) #FIXED "simple" 
                    xlink:href CDATA #REQUIRED

>
<!ATTLIST SONG xmlns CDATA       #FIXED "http://www.cafeconleche.org/namespace/song"
               xmlns:xlink CDATA #FIXED "http://www.w3.org/1999/xlink"
>