Validator for Mac

Much has been made of standards compliance in modern Web browsers. Less is made of the responsibity Web authors have to deliver correct mark-up for these programs, though only valid mark-up is eligible for standards-compliant processing. Typical validation tools tediously operate on one file at a time, often through a Web or editor interface. Validator easily checks one file or a thousand. It efficiently assures all your XML is ready for your workflow.
Features

Validator includes the following features:

• Drag-and-drop interface
• Terse, text-based validation report
• Validates common XML files without need for an Internet connection
• Native support for DocBook, DITA, TEI, SMIL, MathML, SVG, WAP/WML, and more
• Provides several XHTML correctness checks beyond simple validation
• Optional command-line interface
• Automatically skips non-XML files
• Simple "delete it and it's gone" uninstall
• Drag-and-drop installation on Mac OS X