The XMPP Extensions Editor has received a proposal for a new XEP.
Title: Data Forms - Dynamic Forms
Abstract:
This specification provides extensions to the data forms model
defined in previous XEPs that permits enhanced end-user interaction and
a better user experience. It permits forms to react on user input
by permitting the addition, updating or removal of fields in the form,
server-side validation of fields as well as define new
states making it possible to display disabled controls,
controls with undefined values or error messages, while still being
backwards compatible with the existing data form model with available
extensions.
URL: http://xmpp.org/extensions/inbox/dynamic-forms.html
The XMPP Council will decide in the next two weeks whether to accept this
proposal as an official XEP.