// registering class handlers
registerClassHandler(new ExpressionClassValidationElementHandler(namepsaceUri));
// registering property handlers
registerPropertyHandler(new NotNullRuleElementHandler(namepsaceUri));
registerPropertyHandler(new LengthRuleElementHandler(namepsaceUri));
registerPropertyHandler(new EmailRuleElementHandler(namepsaceUri));
registerPropertyHandler(new RegExpRuleElementHandler(namepsaceUri));
registerPropertyHandler(new SizeRuleElementHandler(namepsaceUri));
registerPropertyHandler(new NotEmptyRuleElementHandler(namepsaceUri));