I'm using collada since 1.2.0 and I'm very content with it, but it seem to have a little gap regarding a piece of information that can be easily shared across different applications.
Almost all 3D modelling software allows to assign some text notes (sometimes called comments) to scene objects or group of objects.
It can contain valuable information and it's format is common between various software being just a set of text strings. Sadly there is no place for it in the COLLADA specification.
It seems to be usefull to add a new <note> tag either directly to <node> or inside <extra> tag under the COMMON profile. It's content shall be a simple set of text strings.