David Leal wrote:
> Dear Pat,
>
>
>> Hmm. Maybe Im being naive here, but I don't see why area 0 should be
>> all that difficult to ontologize. In fact, it seems pretty
>> straightforward. Getting wide agreement on a single such ontology
>> might be hard going on impossible, but actually creating a reasonably
>> complete ontology seems manageable.
>>
>
> May be it is not that difficult - it is just that it is important. (A
> nuclear reactor pressure vessel may be simpler than a conventional steam
> drum, but you spend much more time worrying about it.)
>
> Wide agreement is not needed - we just need agreement with the ISO TC12
> people who write the standards on which the ontology will be based. My
> feeling is that the amount of ontological committment within the basic
> metrology standards is small, so that the part of the ontology they will
> want to comment on is small. The rest of the ontology will be our use of
> their standard, and they won't care so much.
>
> We do not know is exactly where the dividing line is, and due dilligence
> requires that we find out.
>
> Best regards,
> David
>
> At 08:54 14/05/2009 -0500, you wrote:
>
>> On May 14, 2009, at 4:31 AM, David Leal wrote:
>>
>>
>>> Dear All,
>>>
>>> There are several different areas related to units, which include:
>>>
>>> 0) A framework ontology covering:
>>> - generic concepts such as: quantity, "quantities of the same kind",
>>> unit,
>>> scale;
>>> - basic scientific quantities, such as mass, length, time-duration,
>>> energy;
>>> - SI units for the basic scientific quantities.
>>>
>>>
>>> 1) The many thousands of different units for basic scientific
>>> quantities
>>> which are used in different parts of engineering and business, such as
>>> furlong, hectare, BTU, US survey foot. There are also measures for
>>> "amount
>>> of stuff", such as bolt of cloth, which are specific to particular
>>> industries.
>>>
>>> 2) "Difficult quantities/properties" such as those in materials
>>> science -
>>> tensile strengths, hardnesses, etc. The result of a high precision
>>> temperature measurement is also a "difficult quantity/property",
>>> because it
>>> is measured according to ITS90.
>>>
>>> 3) Properties at a particular state, such as "dynamic viscosity at 20
>>> degrees C". Here the quantity is simple, but the value is for a
>>> state which
>>> the fluid is not necessarily in.
>>>
>>> There is a pressing need to solve business requirements in area (1)
>>> now!
>>> Fortunately this area is straightforward, and does not rely
>>> crucially on
>>> area (0) which is difficult.
>>>
>> Hmm. Maybe Im being naive here, but I don't see why area 0 should be
>> all that difficult to ontologize. In fact, it seems pretty
>> straightforward. Getting wide agreement on a single such ontology
>> might be hard going on impossible, but actually creating a reasonably
>> complete ontology seems manageable.
>>
>> Pat Hayes
>>
>>
>>
>>
>
> ============================================================
> David Leal
> CAESAR Systems Limited
> registered office: 29 Somertrees Avenue, Lee, London SE12 0BS
> registered in England no. 2422371
> tel: +44 (0)20 8857 1095
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david.leal@xxxxxxxxxxxxxxxxxxx
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http://www.caesarsystems.co.uk
> ============================================================
>
>
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