[tls]

schema.org has lots of data points that can be done via microdata. Dimensions are just a few of them. X-Cart let's me put in the dimensions and filter by them. It only makes sense to me to connect the two.
But I suspect that I am ahead of the game in that Google does not offer parametric search that I can see.

A module could be made that would allow me to flag what attributes I would like added to my microdata.