code: public synchronized Vector getExtentClasses()
      {
          if (extentClassNames.size() != extentClasses.size())
          {
              extentClasses.clear();
              for (Iterator iter = extentClassNames.iterator(); iter.hasNext();)
              {
                  String classname = (String) iter.next();
                  Class extentClass;
                  try
                  {
                      extentClass = ClassHelper.getClass(classname);
                  }
                  catch (ClassNotFoundException e)
                  {
                      throw new MetadataException(
                          "Unable to load class ["
                              + classname
                              + "]. Make sure it is available on the classpath.",
                          e);
                  }
                  extentClasses.add(extentClass);
              }
          }
          return extentClasses;
      }
docs: return all classes in this extent.
  Creation date: (02.02.2001 17:49:11)
  @return java.util.Vector