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XML Schema is an XML-based language for defining validation rules ("schema") in XML-formatted documents. It was the first XML schema language to achieve recommendation status from the W3C. This language is an alternative to the DTD, whose syntax is not based on the XML format... In mid-1999, the W3C consortium (responsible for several WEB standards) first published the XML Schema. Being the first initiative to present an alternative to the DTD standard. After several revisions, in 2001, the final XML Schema recommendation was released and in 2004 there were some adaptations. Since then, several manufacturers have included this standard in their products. There are several APIs for validation, databases that support XML data types, as well as native databases that only work with XML and have XML Schema as their basic consistency control mechanism... The validation of XML files can be done through a specific application or even some other adopted standard.