code: public ReferenceDescriptorDef getReference(String name)
      {
          ReferenceDescriptorDef refDef;
  
          for (Iterator it = _references.iterator(); it.hasNext(); )
          {
              refDef = (ReferenceDescriptorDef)it.next();
              if (refDef.getName().equals(name))
              {
                  return refDef;
              }
          }
          return null;
      }
docs: Returns a reference definition of the given name if it exists.
  
  @param name  The name of the reference
  @return      The reference def or <code>null</code> if there is no such reference