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Duane
Admirable for simplicity, questions on nature of Temporal class and also how does Acceleration enter- interesting that energy and mass ae connected by energy class - ok for now.
Thanks.
Ravi
On Fri, Sep 25, 2009 at 8:20 PM, Duane Nickull <dnickull@xxxxxxxxx> wrote:
I took a deep breath before sending this.
This may be naïve, but I always envisioned something like this. This is not in any formal notation and I hope you can understand the meaning (ironic to state on this list no??). Feel free to pick apart, snub, ignore, criticize or whatever.
For a UoM ontology, I originally envisioned a set of primitive classes that could be inherited and specialized. The primitive classes should be totally abstract and contain concepts only. This would allow existing taxonomies for UoM to make links to the upper ontology.
I agree that details should be left as vague as possible (to quote John S).
Uber Parent Class: Measurement
Class Type: Abstract
Attributes: Units, qualifiers, precision
Class: 2D measurement (linear distance)
Type: primitive, abstract
Class attributes:
Units: the value domain for instances of this class
length qualifier (qualifier for the value domain /units - example: Meters, feet, furlongs..would only be realized in a concrete sub class or existing taxonomic classification)
precision (tolerance qualifier for units)
...
Classes Inheriting from 2D Measurement
Length: a specialized type of the 2d measurement for measuring the longest distance attribute of a given object
Height: a specialized type of the 2D measurement for measuring vertical distance
Width: ......
circumference....a curved measurement (here the precision is really important as it must preserve appearances of curves)
radius....
Related sub Classes
Cube Volume: Combining height,length width etc.
more....
Class: Temporal:
Type: Primitive, abstract
Class Attributes:
Units of measure: the value domain for the instances of this class
Units qualifier (eg seconds, etc., based on zero Length displacement while measuring time)
Class: Energy (primitive class for all energy measurements, including mass)
Type: primitive, abstract
Class attributes:
Mass
Speed
Inheriting classes
Linear Speed
Average Speed
Etc...
Compound classes combine measurements from 2 or more primitive classes such as length and temporal.
Compound class: Length/Temporal – a concept of a displacement measured by both time and distance.
Class attributes:
Point A: a three dimensional point in space, referenced via a second three dimensional point in space
Point B: a three dimensional point in space, juxtaposed to the first 3 dimensional point in space.
Temporal reference A:
Temporal Reference B:
etc...
On 9/25/09 12:10 PM, "ravi sharma" <drravisharma@xxxxxxxxx> wrote:
Ed
I am glad that the nature of mass is not entering this discussion and we are limiting ourselves to objects (things) such as quantity, units, measures, and others, as well as algorithmic or rules based conversions and other transformations (as a parallel - I am probably seeing these akin to metadata). These alone are not trivial as seen by dozens of submissions on this topic since yesterday.
SI, VIM, UCUM, and what else (?) ought to be the minimum set of concepts /standards before we can at least specify a relevant ontology for Units relating to "mass" as example? Or, is it too early to expect a design pattern?
P.S. I would also like some of us to start a thread on physics and conceptual definition on nature of a physical quantity such as "mass", "photon", etc. if there is sufficient interest.
Regards.
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Thanks.
Ravi
(Dr. Ravi Sharma)
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