In addition even if it was ?x ?p ?y it wouldn't return the appropriate
list of relations as within OWL ontologies the properties are mostly
used in restrictions (i.e. to make quantified propositions). (01)
For those the query would need to be something like (02)
prefix owl: <http://www.w3.org/2002/07/owl#>
select count distinct ?p where
{ ?restriction owl:onProperty ?p } (03)
When I run this on the neurocommons instance, which has a different
set of ontologies than bioportal, I get 1070 properties.
(http://tinyurl.com/6cjvq2x)
It wasn't clear how to do an equivalent query against BioPortal. (04)
That's not to say all is well - an examination of those properties
will show many overlaps - same property intended, different URL. And
there are many ontologies that in fact do not use anything but
subClassOf. And many more where the relations and terms are given no
definition or documentation. There are lots of problems and I agree
with some of John's conclusions about the use of OWL, although don't
place the fault with OWL - rather it is a lack of training, tools, and
organization that in many cases leads to these situations. (05)
But the stated basis for John's comment is not sustained. (06)
-Alan (07)
On Thu, Jan 13, 2011 at 9:40 AM, John F. Sowa <sowa@xxxxxxxxxxx> wrote:
> Ian,
>
> Yes. I noticed that point as soon as I saw my own note in the inbox,
> and I sent off the correction just before I found your note.
>
>> That SPARQL query returns all relationships between the same class, so
>> what's being exposed here is not a hierarchy, but a test to see what
>> relationships exist between x and x.
>
> I apologize for not proofreading my own note *before* I sent it.
>
> John
>
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