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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.

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.

New Mexico Institute of Mining and Technology: Science, Engineering, Research, University

XML Editor, XMLwriter for Windows, is a powerful award-winning XML development tool that supports XML, XSLT, DTD, XSD Schema, CSS, and HTML editing. Within the editor you can convert XML to HTML using XSLT stylesheets, or format and preview XML do...

Articles and resources aimed at improving the health of the Web.

Total Validator is an (X)HTML validator, an accessibility validator, a spell checker, and a broken links checker all rolled into one tool allowing one-click validation of your entire site.

XMLBlueprint is a lightweight XML editor that supports XML documents, DTDs, Relax NG Schemas and XML Schemas. It supports XSLT transformations, Unicode.