code: public XAttributeDiscrete createAttributeDiscrete(String key, long value,
  			XExtension extension) {
  		return new XAttributeDiscreteImpl(intern(key), value, extension);
  	}
docs: /* (non-Javadoc)
  @see org.deckfour.xes.model.factory.XModelFactory#createAttributeDiscrete(java.lang.String, long, org.deckfour.xes.extension.XExtension)