Ein Beispiel
   <?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE messages SYSTEM "message.dtd">
<messages>
 <argdecl>
  <name>floor</name>
  <datatype><int/></datatype>
  <description>The target floor</description>
 </argdecl>
 <message>
  <name>GO</name>
  <description>Instructs RCX to move to that
        floor.</description>
  <argument>floor</argument>
 </message>
</messages>