code: public XML addClass(Class<?> aClass, Global global, Attribute[] attributes){
  		XmlClass xmlClass = new XmlClass();
  		xmlClass.name = aClass.getName();
  		xmlJmapper.classes.add(xmlClass);
  		
  		if(!isEmpty(attributes)){
  			xmlClass.attributes = new ArrayList<XmlAttribute>();
  			addAttributes(aClass, attributes);
  		}
  		if(global != null)
  			addGlobal(aClass, global);
  		
  		return this;
  	}
docs: This method adds aClass with this global mapping and attributes to XML configuration file.<br>
  It's mandatory define at least one attribute, global is optional instead.
  @param aClass Class to adds
  @param global global mapping
  @param attributes attributes of Class
  @return this instance