Re: [uom-ontology-std] "Indirect property" - more

[Duane Nickull <dnickull@xxxxxxxxx>]

However, this assumes a direct line.  A real waterline is not always straight.  The hull of the ship is usually curved in at least one axis and the water that meets the vessels hull is affected by forces which create waves and adhesion.

Nevertheless, I understand what you are suggesting.

D


On 10/2/09 8:14 AM, "David Leal" <david.leal@xxxxxxxxxxxxxxxxxxx> wrote:

> Dear Joe,
>
> What I am saying is simpler than that.
>
> If we interpret the magnitude of length expressed as "30 m" as an
> equivalence class of point pairs, then the statement:
>
>  my_pair has_a_separation_of 30m
>
> is merely a statement of classification.
>
> The statement:
>
>  my_ship has_a_waterline_length_of 30m
>
> is not a statement of classification.
>
> The relationship between my_ship and 30m is "indirect". It relies upon:
> - relationship between my_ship and the two points at the intersection of the
> waterline plane, the plane of symmetry, and the outside of the ship;
> - the classification of that point pair as a member of 30m.

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