/**
  * Accessor for the extent of a candidate class.
  *
  * @param cls The candidate class
  * @return The extent for these classes
  */
 public Extent getExtent(Class cls) {
   checkStatus();
   return pm.getExtent(cls);
 }
 /**
  * Accessor for the extent of a candidate class.
  *
  * @param cls The candidate class
  * @param subclasses Whether to include subclasses
  * @return The extent for these classes
  */
 public Extent getExtent(Class cls, boolean subclasses) {
   checkStatus();
   return pm.getExtent(cls, subclasses);
 }