[jsr-314-open] Adding an extension mechanism to the JavaScript event data payload

And as long as I'm discussing the JavaScript event data payload, one thing that got stripped out during the specification process was the ability to extend the payload object in a compatible way. At least one of the proposals I made was to simply prefix any property to the object that's implementation specific with a "x". Another way could be defining a "extension" object that's a property of the data object, hanging all impl specific properties off of there. If we don't have that extension mechanism, then adding something like a description property to that object becomes a compatability problem - since a future version of the spec may add a description property, breaking existing apps. Again, I think that defining something like this could fall into an Errata. Thoughts? I've filed Issue 571 to track this issue. https://javaserverfaces-spec-public.dev.java.net/issues/show_bug.cgi?id=571 Jim