Abstract: Validation of a document plays a very important role and also solves a number of important issues when working with XML and XML related technologies. Validation allow to work with modules and performing multiple validations in one actions. During the last few years a number of different XML schema languages have appeared as suggested replacements for the ageing Document Type Definition (DTD). Schematron [Schematron] is an XML schema language designed and implemented by Rick Jelliffe at the Academia Sinica Computing Centre, Taiwan. It combines powerful validation capabilities with a simple syntax and implementation framework. In this paper authors explain how a document can be validated through XML Schema and how a rule based validation can be implemented with Schematron. But when several validations is in computing process, performance of Schematron is degraded. To cope this degradation RELAX-NG is useful for validating a document.