300757 - Implement mustUnderstand attribute

Status: RESOLVED WONTFIX

(Core Graveyard :: XForms, defect)

Description

[Allan Beaufour]

The spec defines a xforms:mustUnderstand attribute that can be placed on _any_
element in _any_ namespace. Argh.

We might need some xtf-like functionality for attributes (possibly also need for
bug 280368).

Comment 1

[Allan Beaufour]

Here's a take on how it could be done: Before sending xforms-ready, we should do a 
document.evaluate("//*[@xf:mustUnderstand = 'true']",
                  document,
                  NSResolver,
                  XPathResult.ANY_TYPE,
                  null);
And then run through all the returned nodes, and figure out whether they are implemented... 

Question is what that means. I wonder if we can ask nsIContent for example whether it has a native implementation or an XBL binding. Maybe just whether it is possible to QI to a given class?

Comment 2

[David Bolter [:davidb] (NeedInfo me for attention)]

RIP xforms