Validation of XML documents is a challenging task whose aim is to ensure interoperability of such documents in various environments. With massive use of different XML languages, automated validation is often the only way to ensure compliance with different standards and recommendations. That's why it is important to use expressive validation languages and powerful and convenient validation tools and techniques to discover maximum standard violations automatically. This is the aim of the Relaxed project which is introduced within this text. Different approaches to face today's pressing validation issues and challenges used in Relaxed are examined; e. g. maximizing validation results by using expressive validation languages, schema modularization and reusability, effective compound document validation and validation of non-XML languages. Advanced approaches to XML document validatio
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