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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.

SitePoint.com - With a vast variety of web design tutorials and articles coupled with a vibrant and well informed community, SitePoint the natural place to go to grow your online business

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.

Oracle Documentation

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.

The Microsoft Support home page is your support portal for Microsoft products. Download updates and find top issues, error messages, and troubleshooting tips for Windows XP, Windows Vista, Windows 7, Office 2010, the 2007 Microsoft Office system, and...