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A web-based XML validator. Can be used for free. Validates XML files, prompts the user for referenced files (e. g., XSD), shows good error messages.

Codeguru is where developers can come to share ideas, articles, questions, answers, tips, tricks, comments, downloads, and so much more related to programming in areas including C++, Visual C++, C#, Visual Basic, ASP, ASP.NET, Java, and more.

Forum, Wiki, FAQ, Groups - the official Qt community site. Here you can get started with Qt, read tutorials, find solutions to your challenges and get up to date on the latest developments.

A collection of 30 free tutorial books by Herong Yang on latest programming technologies. Tutorials in all books are based on Herong

The World Wide Web Consortium (W3C) is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards.

oXygen XML Editor is a cross platform XML Editor providing tools for XML authoring, XML conversion, XSL, XSLT, XQuery, XML Schema, DTD, Relax NG and Schematron development, SOAP and WSDL.