Yes, possibly. As I said "Or may be some variation on the above that 
distinguishes between bridge heights and other height measurements.” I didn’t 
find a height quantity kind in QUDT. 

My main point on how a restriction could look like, however, was that there 
would be some class, instances of which are certain quantities e.g., bridge 
heights. Thus, a restriction on the class Bridge could point to that class. 

I think other modeling patterns are also possible with QUDT. I t would be good 
to have a few examples of how to use it.

> On May 9, 2017, at 9:58 AM, Jack Hodges <[email protected]> wrote:
> 
> Irene,
> 
> It seems to me that 'height' should be a quantity kind and not a quantity. A 
> bridge's height could be a quantity but height is too general. The question 
> to ask of qudt is whether there are like quantity kinds, such as weight, 
> size, velocity, etc., which there are. A quantity kind is more of a type that 
> is associated with a dimensionality but no value. A quantity has a value, 
> which makes it contextual.
> 
> I could see Michael creating a bridge class in some kind of device taxonomy 
> (since it has functionality), and I could see a device having any number of 
> named quantities that are causally related to its functionality. After all, 
> height and weight are of little value unless we are talking about how they 
> impact a design or use of an object.
> 
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