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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.

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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.

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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...

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.

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

Free, Online, Help, Books, Web, Development, resources, HTML, CSS, JavaScript, DHTML, XML, XHTML, ASP, ADO, .NET, VBScript, C++, C#, Flash, Java, PHP, Apache, Unix, linux, Shell, VB, Perl, CGI, Designing, tutorials, help, programming, Dreamweaver, A...

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Altova XMLSpy XML editor, plus other leading XML, data management, UML, and Web services software tools for application, web site, and database development, data conversion, and more.