I see what you mean, but I'm not sure it would help much.

For instance, in the above tree, a prop file needs to reference an OBJ in the geom folder.

Under current Poser practice, it's

objFileGeom ":runtime:Geometries:SignalHouse:periscope.obj"

By HTML practice, it would be

objFileGeom "../../Geometries/SignalHouse/periscope.obj"

Saves some characters but loses some clarity.  It would allow a different directory structure not based on a folder named Runtime, but again I'm not sure the flexibility is worth the increased difficulty in automatic searching. 

Specifically, when adding a set of folders to Poser's library, you'd have to navigate to the proper level without any definite landmarks.  As it is, Poser is able to find the proper 'foundation point' automatically by looking for the folder named Runtime.

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