code: public XML deleteGlobal(Class<?> aClass){
  		checksGlobalExistence(aClass);
  		
  		XmlClass xmlClass = findXmlClass(aClass);
  		if(isEmpty(xmlClass.attributes)) deleteClass(aClass);
  		else 							 xmlClass.global = null;
  		return this;
  	}
docs: This method deletes the global to an existing Class.
  @param aClass class to delete
  @return this instance of XML