code: private Class<? extends Field> getClassObject(final Element element) {
  		String className = element.getAttributeValue(XMLTags.CLASS);
  		Class<? extends Field> classObject = null;
  		try {
  			className = className.indexOf('.') > 0 ? className : getClass().getPackage().getName() + '.' + className;
  			classObject = Class.forName(className).asSubclass(Field.class);
  		} catch (ClassNotFoundException e) {
  			throw new IllegalStateException("could not get class " + className, e);
  		}
  		return classObject;
  	}
docs: This method returns the class object from which a new instance shall be generated. To achieve
  this the class attribute of the passed element is taken to determine the class name.