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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.

W3C

XML.com, where the XML community shares XML development resources and solutions, features timely news, opinions, features, and tutorials; the Annotated XML specification created by Tim Bray; authoring tools, XML developer resources, interactive forum...

Online tools for developers, including formatters (JSON, XML, HTML, SQL, etc.), minifiers (JavaScript, CSS), validators, compactors and many more!

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

Web Design and HTML are all about creating a great Web site. Use Web development and Web site design to build Web sites that customers return to over and over again. On this site learn the basics of Web design, HTML, XML, and Web development.

Resources from the authors, creators, innovators, & leaders of technology - home to leading publishers Addison-Wesley Professional, Prentice Hall Professional, & Sams.