<!ENTITY % Number "CDATA">
    <!-- one or more digits -->

<!ENTITY % URI "CDATA">
    <!-- a Uniform Resource Identifier, see [RFC2396] -->

<!ELEMENT course-home-page
  (lecture-names, links)
>

<!ATTLIST course-home-page
  name                 CDATA          "#REQUIRED"
  number-of-lectures   %Number;        "#REQUIRED"
  current-lecture      %Number;        "#IMPLIED"
>

<!ELEMENT lecture-names
  (lecture-name+)
>

<!ELEMENT lecture-name
  (#PCDATA)
>

<!ELEMENT links
  (link*)
>

<!ELEMENT link
  (#PCDATA)
>

<!ATTLIST link
  href               %URI;             "#REQUIRED"
>