I have been looking at the mapping of RDA content types to BIBFRAME Work
subclasses (Appendix 1 of
http://bibframe.org/documentation/resource-types/). Generally it works
well, but there are two problems.
1) The class bf:Tactile is a subclass of bf:Instance but it should be
changed to a subclass of bf:Work in parallel with the other content-type
2) RDA has three content types for sound: performed music, sounds, and
spoken word. The proposed subtypes of bf:Audio, which are needed for the
mapping, have not been defined, as far as I can see.
Also, note that the name of the property bf:ThreeDimensionalObject is
narrower than the scope of its definition: bf:ThreeDimensional would be a
better, more general name. That is, "object" in ThreeDimensionalObject
implies something tangible, while the definition says "Resource in a form
intended to be perceived visually in three-dimensions", which is not
specifically tangible and could apply to a 3D movie.