code: private Class<? extends Constraint> getClassObject(final Element element) throws ClassNotFoundException {
  		String className = element.getAttributeValue(XMLTags.CLASS);
  		className = className.indexOf('.') > 0 ? className : getClass().getPackage().getName() + '.' + className;
  		return Class.forName(className).asSubclass(Constraint.class);
  
  	}
docs: This method returns the class object of which a new instance shall be generated. To achieve
  this the class attribute of the passed element will be used to determine the class name