E.g. camera, lamp and empty (Null) data all use the same "NodeAttribute" element type,
while having different "sub-types" (FbxNull, FbxCamera, etc.) with different properties.

It would have been perfectly possible to have multiple property templates, but from
"reading" official FBX files, it’s obvious this is not supported, so in this case we
have to pick one to write a real template, and for the other subtypes, we have to
explicitely write the whole templates' content in each and every element...

At this point, you might wonder why introducing templates, if you have to handle
such hairy cases? Well, I’m wondering too...