W3C home > Mailing lists > Public > public-semweb-lifesci@w3.org > March 2013

Re: owl:sameAs - Is it used in a right way?

From: David Booth <david@dbooth.org>
Date: Sun, 17 Mar 2013 21:52:38 -0400
Message-ID: <51467366.3060808@dbooth.org>
To: Oliver Ruebenacker <curoli@gmail.com>
CC: Jim McCusker <mccusj@rpi.edu>, Jeremy J Carroll <jjc@syapse.com>, Umutcan ŞİMŞEK <s.umutcan@gmail.com>, Kingsley Idehen <kidehen@openlinksw.com>, w3c semweb HCLS <public-semweb-lifesci@w3.org>
Hi Oliver,

On 03/17/2013 10:55 AM, Oliver Ruebenacker wrote:
>       Hello,
>
> On Sat, Mar 16, 2013 at 12:30 PM, David Booth <david@dbooth.org> wrote:
>> You are in good company in thinking that a URI always denotes the same
>> resource, because that is a widespread misconception.  (I call it Myth #1 in
>> http://dbooth.org/2010/ambiguity/paper.html .)  But it simply is not true in
>> the RDF semantics.
>> [...]
>> That is precisely why it is helpful to keep different perspectives in
>> different graphs, as Jeremy suggested.
>
>    That's a little bit like saying, since floating-point numbers are
> not perfectly precise, the 1.376 in my data may not be the same as the
> 1.376 in your data, and therefore the two values should be kept in
> separate spaces.

I don't follow what you mean.  A floating point number like 1.376 may be 
used as an approximation of some real number, but it is exactly the same 
floating point number in all RDF graphs.

David
Received on Monday, 18 March 2013 01:53:12 UTC

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