At 9:10 AM -0500 3/4/08, Alan Ruttenberg wrote:
>As used in the OBO Foundry, orthogonality is better first understood
>on a term by term basis. Adding a term that is trivially redundant
>with another one, by denoting the same thing, is the first thing to
>avoid. Less trivially, if there is a way to logically define the new
>terms in terms of existing ones, then not doing so leads to a
>situation where two users might denote the same thing in two
>unconnected ways: Using the new term, or using the compound of
>existing terms. This is also to be avoided, if possible. (01)
That all sounds reasonable. What has it got to do
with the topic of the question? (02)
>
>The reason to avoid these situations is that one typically uses an
>ontology to mediate queries and it is desirable to have any query
>return all relevant answers. Having two ways to say the same thing
>means that the user needs to know both ways to ask the question, and
>this puts a higher burden on learning and using the ontology. (03)
Quite. I repeat, what has this got to do with
'orthogonality' (whatever that is supposed to
mean)? (04)
>
>Generalizing to orthogonality between ontologies, we'd understand two
>ontologies as being orthogonal if no term in one is orthogonal to the
>other ontology, in the senses above. (05)
You havn't GIVEN a 'sense above'. (06)
Also, this reads oddly. Two ontologies are foodle
if NO term in one is foodle to the other? Are you
sure that is what you meant to say? (07)
>
>-Alan
>(preparing to take cover ;-) (08)
No, don't take cover. Just tell us what the hell you are talking about. (09)
Pat (010)
>
>On Mar 4, 2008, at 8:42 AM, Bill Andersen wrote:
>
>> It's a category error to apply the notion of orthogonality to
>> ontologies since ontologies are not vectors.
>>
>> More informally speaking, there may be some sort of linguistic-based
>> heuristic notion you're after but you'd have to say what that might be
>> and what you want to do with it.
>>
>> Bill Andersen
>> Ontology Works, Inc.
>> 3600 O'Donnell Street, Suite 600
>> Baltimore, MD 21224
>> +1.410.675.1204 (w)
>> +1.410.675.1201 (f)
>> +1.443.858.6444 (m)
>>
>>
>> On Mar 4, 2008, at 5:31 AM, "Alexander Garcia Castro"
>> <alexgarciac@xxxxxxxxx
>>> wrote:
>>
>>> Hopefully this is not so out of focus. I am looking for a definition
>>> for orthogonality. When are ontologies orthogonal? Any body who can
>>> recommend me some good papers about orthogonal ontologies? Is there
>>> a measure for orthogonality?
>>>
>>>
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