Example XML Configuration, 2nd Draft

 <ttm version="0.2.0">
     <modules>
     ...
     </modules>
     <resources>

         <!-- Resources that are assigned by hand -->
         <constants>
             <resourcetype type="teacher">

                 <!-- Each resource can be defined individually -->
                 <resource name="john"/>
                 <resource name="albert">
                     <restriction type="capability-place">lab</restriction>
                 </resource>
             </resourcetype>
             <resourcetype type="class">
                 <resource name="1 a"/>
                 <resource name="2 a"/>
                 <resource name="3 a">
                     <restriction type="example">xxx</restriction>
                 </resource>
             </resourcetype>
         </constants>

         <!-- Resources that are assigned by the genetic algorithm -->
         <variables>
             <resourcetype type="time">

                 <!-- A matrix of 35 resources defined with a single tag -->
                 <!-- 5 days with 7 timeslots each. -->
                 <matrix width="5" height="7"/>
             </resourcetype>
             <resourcetype type="room">
                 <resource name="gym"/>
                 <resource name="lab">
                     <restriction type="capability-place">lab</restriction>
                 </resource>

                 <!-- A row of 10 resources defined with a single tag -->
                 <linear from="1" to="10"/>
             </resourcetype>
         </variables>
     </resources>

     <events>
         <event name="mathematics" repeats="1">
             <resource type="teacher" name="john"/>
             <resource type="class" name="1 a"/>
             <restriction type="example">xxx</restriction>
         </event>
     </events>
 </ttm>