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

<!-- DTD for a single video topic -->

<!ELEMENT videoTopic 
(textDescription,imageExample*,videoExample*,audioExample*)> 
<!ATTLIST videoTopic          num   CDATA #REQUIRED>

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

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

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

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