this.interfaceName);
myInterface);
  private boolean addInternal(Attribute attribute, Class interfaceName)  {    if (attribute == null)      throw new NullPointerException("attribute may not be null");    AttributeSetUtilities.verifyAttributeCategory(interfaceName,						  this.interfaceName);    Object old = attributeMap.put      (attribute.getCategory(), AttributeSetUtilities.verifyAttributeValue                                  (attribute, interfaceName));    return !attribute.equals(old);  }