The HTML4 form semantics are extended with new types, new attributes for defining constraints, new DOM interfaces for validation, and new events for dependency tracking. A repeating model is introduced for declarative repeating of form sections. Mechanisms for XML submission and initialization of forms are added to the form submission model. HTML4, XHTML1.1 and the DOM are thus extended in a manner which has a clear migration path from existing HTML forms, leveraging the knowledge authors have built up with their experience with HTML so far.

this seems like a sane migration path to the xforms promised land without throwing away billions of $ of html forms investment.

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