<?xml version="1.0" encoding='ISO-8859-1'?>

<!ELEMENT videoTopic (textDescription, imageExample*, videoExample*, audioExample*, knownItem*)>
<!ATTLIST videoTopic          num           CDATA       #REQUIRED
                              interactive   (Y-I|N-I)   #REQUIRED 
                              automatic     (Y-A|N-A)   #REQUIRED
                              knownItems    (Y-K|N-K)   #REQUIRED> 

<!ELEMENT textDescription     EMPTY>
<!ATTLIST textDescription     text CDATA #REQUIRED>

<!ELEMENT imageExample        EMPTY>
<!ATTLIST imageExample        src  CDATA #REQUIRED>

<!ELEMENT videoExample        EMPTY>
<!ATTLIST videoExample        src    CDATA #REQUIRED
                              start  CDATA #IMPLIED 
                              stop   CDATA #IMPLIED>

<!ELEMENT audioExample        EMPTY>
<!ATTLIST audioExample        src    CDATA #REQUIRED
                              start  CDATA #IMPLIED 
                              stop   CDATA #IMPLIED>

<!ELEMENT knownItem           EMPTY>
<!ATTLIST knownItem           src    CDATA #REQUIRED
                              start  CDATA #REQUIRED 
                              stop   CDATA #REQUIRED>
