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Hi;<br>
<br>
a little aside<br>
<br>
On az., 2011.eko mairen 04a 04:34, Hilmar Lapp wrote:
<blockquote
cite="mid:3DD7CAA7-3752-4DDE-BAB9-1682E68184DC@nescent.org"
type="cite"><br>
<div>
<div>On May 3, 2011, at 9:00 PM, Steve Baskauf wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite"><span class="Apple-style-span"
style="border-collapse: separate; color: rgb(0, 0, 0);
font-family: Helvetica; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: normal; orphans: 2; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; font-size: medium;">But I was under the
impression that one models things by describing classes and
the properties that connect them.</span></blockquote>
<div><br>
</div>
<div>In OWL, properties connect instances, not classes. RDF
allows metaclasses (things that are classes and instances),
but doing this will throw most (all?) reasoners off the track.</div>
</div>
</blockquote>
<br>
Just to add to the discussion, puning can be used to model clases as
instances. In fact, a common pattern I'm seing and I'm using is to
use puning and have a class hierarchy, each class having an instance
with the same URI, so one can refer to each class as a class or as
an instance, depending on the context.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.w3.org/2007/OWL/wiki/Punning">http://www.w3.org/2007/OWL/wiki/Punning</a><br>
<br>
cheers<br>
<br>
<blockquote
cite="mid:3DD7CAA7-3752-4DDE-BAB9-1682E68184DC@nescent.org"
type="cite">
<div><br>
<blockquote type="cite"><span class="Apple-style-span"
style="border-collapse: separate; color: rgb(0, 0, 0);
font-family: Helvetica; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: normal; orphans: 2; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; font-size: medium;"> Classes are (to me)
a very different thing than instances of classes. A model
containing more than 13.6 million classes is at least 1.9
million times as complicated as a model with 7 classes.</span></blockquote>
<div><br>
</div>
<div>Yes and no. I can model a taxonomy as a subclass hierarchy
of classes, or as a property-based (memberOf or some such)
hierarchy of individuals that all instantiate a single "Taxon"
class. The former isn't 1 million times more complex than the
latter. However, they are not identical either, and which
approach one chooses has significant consequences for how easy
it is to express things about those taxa, and for inferring
new things from those with a DL reasoner. </div>
<br>
<blockquote type="cite"><span class="Apple-style-span"
style="border-collapse: separate; color: rgb(0, 0, 0);
font-family: Helvetica; font-style: normal; font-variant:
normal; font-weight: normal; letter-spacing: normal;
line-height: normal; orphans: 2; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; font-size: medium;"> I would hate to
have to draw an RDF graph of that model</span></blockquote>
</div>
<div><br>
</div>
<div>I would as much hate to have to draw an RDF graph of 1.7
million instances. The point being, in order to draw a graph of
how someone models a domain you don't draw a graph of the entire
RDF triple store.</div>
<div><br>
</div>
<div><span class="Apple-tab-span" style="white-space: pre;"> </span>-hilmar</div>
<br>
<div> <span class="Apple-style-span" style="border-collapse:
separate; color: rgb(0, 0, 0); font-family: Helvetica;
font-size: 12px; font-style: normal; font-variant: normal;
font-weight: normal; letter-spacing: normal; line-height:
normal; orphans: 2; text-indent: 0px; text-transform: none;
white-space: normal; widows: 2; word-spacing: 0px;">
<div style="word-wrap: break-word;">
<div><font class="Apple-style-span" face="Monaco" size="3"><span
class="Apple-style-span" style="font-size: 11px;">-- </span></font></div>
<div><font class="Apple-style-span" face="Monaco" size="3"><span
class="Apple-style-span" style="font-size: 11px;">===========================================================</span></font></div>
<div><font class="Apple-style-span" face="Monaco" size="3"><span
class="Apple-style-span" style="font-size: 11px;">:
Hilmar Lapp -:- Durham, NC -:-
informatics.nescent.org :</span></font></div>
<div><font class="Apple-style-span" face="Monaco" size="3"><span
class="Apple-style-span" style="font-size: 11px;">===========================================================</span></font></div>
<div><br class="webkit-block-placeholder">
</div>
</div>
</span><br class="Apple-interchange-newline">
</div>
<br>
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</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Mikel Egaña Aranguren, PhD
<a class="moz-txt-link-freetext" href="http://mikeleganaaranguren.com">http://mikeleganaaranguren.com</a>
Marie Curie post-doc at Ontology Engineering Group, UPM
<a class="moz-txt-link-freetext" href="http://www.oeg-upm.net/">http://www.oeg-upm.net/</a></pre>
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