XSD (XML Schema Definition), a recommendation of the World Wide Web Consortium (W3C), specifies how to formally describe the elements in an Extensible Markup Language (XML) document. It can be used by programmers to verify each piece of item content in a document...

An XML Schema describes the structure of an XML document. The XML Schema language is also referred to as XML Schema Definition (XSD).

Relationship between XSD and other specifications · XSD versions · Changes to content models · Assertions and XPath Identifies the language described in version X.Y of the XSD specification.