A new version of the W3C Markup Validator tool has been released, available as source code and through an online forms-based interface. Maintained by members of the W3C QA Activity Team and external collaborators, the Markup Validator is a free service that checks documents like HTML and XHTML for conformance to W3C Recommendations and other standards. The forms allow one to enter a URI or to upload files from a local computer and have the documents validated. When using the simple form, the validator attempts to detect the document type and encoding automatically; the advanced interface allows one to specify the document type and encoding. The enhanced Markup Validator tool has improved and more accessible interfaces, support for more document types, better internationalization support, restructured code and design, and other features. Noteworthy changes and additions include: (1) Support for MathML is back in good shape; (2) Support for application/xhtml+xml; (3) Support for XHTML+MathML and XHTML+MathML+SVG; (4) Support for SVG and image/svg+xml; (5) Support for XHTML 1.0 Second Edition and XHTML 1.1.

Related news: On 2002-11-25, Henry S. Thompson announced that a modestly significant new release of the W3C Validator for XML Schema is available via the Web form; it is also available for download. See the status page for details.

Related W3C validation tools:

• Validate your CSS using the W3C CSS Validation Service
• Validate your RDF using the W3C RDF Validation Service
• Validate your XML Schema documents using the W3C XML Schema Validator