code: public XAttributeList createAttributeList(String key, XExtension extension) {
  		return new XAttributeListImpl(intern(key), extension);
  	}
docs: /* (non-Javadoc)
  @see org.deckfour.xes.factory.XFactory#createAttributeList(java.lang.String, org.deckfour.xes.extension.XExtension)