<div dir="ltr"><div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)">Per Martins comment:</div><div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)">
> <span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">> since such URIs designate the *class* of all instances of concrete (in this sense: particles), but you need an individual (in OWL) to express "concrete" as a type of material.</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)"><br></span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">This is definitely true if you want to stay in OWL DL. If you are OK with using OWL-Full, you probably could go ahead and use the existing class for concrete as the value of the property. Staying in OWL DL has the advantage of doing inference more efficiently. I'm not aware of anyone running DL provers over Goodrelations product data. so this might not matter. If you go the OWL DL route, you end up doing one of the following neither being particularly nice.</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)"><br></span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">Having two URIs that essentially mean the same thing:</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">1. a class "Concrete" whose instances are quantiies of actual concrete, and which really means the type of material that is concrete, in the same way that the classs "Car" means the type of thing that is a car.</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">2. an individual that means the type of material that is concrete. </span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)"><br></span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">-OR-</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">Having two ways to relate an thing to the type of thing it is.</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">1. The standard way is to use rdf:type. </span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">2. But if you create an individual as Martin suggests, and if you want to have any instances of the concrete, then you cannot use rdf:type, you have to make up another object property that means the same thing (e.g. hasType), but that does not have the benefits of built in inference that you get with rdf:type. </span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)"><br></span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)">Any of these things work, you have to decide which one makes the most sense for your situation.</span></div>
<div class="gmail_default" style="font-family:'comic sans ms',sans-serif;font-size:small;color:rgb(0,0,0)"><span style="font-family:arial,sans-serif;font-size:12.800000190734863px;color:rgb(34,34,34)"><br></span></div>
<div class="gmail_default"><font face="arial, sans-serif">More on this kind of thing in this note: </font><a href="http://www.w3.org/TR/swbp-classes-as-values/">http://www.w3.org/TR/swbp-classes-as-values/</a></div><div class="gmail_default">
<br></div><div class="gmail_default">Michael </div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Nov 28, 2013 at 3:00 AM, <span dir="ltr"><<a href="mailto:goodrelations-request@ebusiness-unibw.org" target="_blank">goodrelations-request@ebusiness-unibw.org</a>></span> wrote:<br>
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Today's Topics:<br>
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1. Re: Defining material types (David Deering)<br>
<br>
<br>
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<br>
Message: 1<br>
Date: Wed, 27 Nov 2013 08:41:05 -0600<br>
From: David Deering <<a href="mailto:david@touchpointdigital.net">david@touchpointdigital.net</a>><br>
To: Martin Hepp <<a href="mailto:martin.hepp@ebusiness-unibw.org">martin.hepp@ebusiness-unibw.org</a>><br>
Cc: <a href="mailto:goodrelations@ebusiness-unibw.org">goodrelations@ebusiness-unibw.org</a><br>
Subject: Re: [goodrelations] Defining material types<br>
Message-ID: <<a href="mailto:52960481.8070405@touchpointdigital.net">52960481.8070405@touchpointdigital.net</a>><br>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"<br>
<br>
Thank you, Martin, I appreciate the direction and the example. And yes,<br>
I'd definitely be in favor of seeing a "material" or "madeOf" property<br>
added to GoodRelations and <a href="http://schema.org" target="_blank">schema.org</a>, as this would help webmasters<br>
define even more precisely certain elements on their pages. Thanks.<br>
<br>
David Deering<br>
<br>
<br>
On 11/26/2013 11:25 AM, Martin Hepp wrote:<br>
> Hi David:<br>
><br>
> First, you need a property for the "material" relationship between a product and its material.<br>
><br>
> You could either define one yourself in your own namespace, as described here:<br>
><br>
> <a href="http://wiki.goodrelations-vocabulary.org/Documentation/Extensions" target="_blank">http://wiki.goodrelations-vocabulary.org/Documentation/Extensions</a><br>
><br>
> # Defining the property<br>
> foo:material<br>
> a owl:ObjectProperty ;<br>
> rdfs:domain gr:ProductOrService ;<br>
> rdfs:range schema:Thing ;<br>
> rdfs:subPropertyOf gr:qualitativeProductOrServiceProperty .<br>
><br>
> Or you could reuse one from other GoodRelations extensions from this list:<br>
><br>
> <a href="http://wiki.goodrelations-vocabulary.org/Vocabularies" target="_blank">http://wiki.goodrelations-vocabulary.org/Vocabularies</a><br>
><br>
> e.g. the FreeClassOWL ontology at<br>
><br>
> <a href="http://www.freeclass.eu/freeclass_v1" target="_blank">http://www.freeclass.eu/freeclass_v1</a><br>
><br>
> has the property<br>
><br>
> <a href="http://www.freeclass.eu/freeclass_v1.html#P_E67" target="_blank">http://www.freeclass.eu/freeclass_v1.html#P_E67</a> ("base material").<br>
><br>
> Then you need to model the material. You CANNOT directly use <a href="http://www.productontology.org" target="_blank">www.productontology.org</a> URIs, like<br>
><br>
> <a href="http://www.productontology.org/id/Concrete" target="_blank">http://www.productontology.org/id/Concrete</a><br>
><br>
> since such URIs designate the *class* of all instances of concrete (in this sense: particles), but you need an individual (in OWL) to express "concrete" as a type of material.<br>
><br>
> The most straightforward way is using DBPedia URIs whenever you need individuals and <a href="http://www.productontology.org" target="_blank">www.productontology.org</a> URIs when you need types or classes.<br>
><br>
> The full pattern would be<br>
><br>
> # Describing a product<br>
><br>
> @prefix gr: <<a href="http://purl.org/goodrelations/v1#" target="_blank">http://purl.org/goodrelations/v1#</a>> .<br>
> @prefix pto: <<a href="http://www.productontology.org/id/" target="_blank">http://www.productontology.org/id/</a>> .<br>
> @prefix dbpedia: <<a href="http://dbpedia.org/resource/" target="_blank">http://dbpedia.org/resource/</a>> .<br>
> @prefix foo: <<a href="http://example.com/" target="_blank">http://example.com/</a>> .<br>
><br>
> foo:ConcreteTube a gr:ProductOrService, gr:Individual ;<br>
> a pto:Tube_(fluid_conveyance) ; # It is a tube<br>
> gr:name "A single tube made from concrete" ;<br>
> foo:material dbpedia:Concrete. # It is made from concrete.<br>
><br>
> That should do the trick.<br>
><br>
> We will consider adding a madeOf or material property to GoodRelations and propose it to <a href="http://schema.org" target="_blank">schema.org</a>.<br>
><br>
> Martin<br>
><br>
><br>
> On Nov 26, 2013, at 5:53 PM, David Deering wrote:<br>
><br>
>> I have been doing some research and so far have been unable to find the answer, so I am hoping that I might be able to get some help here. My question is: Is there a way to define a product's material type, such as glass, stone, wood, etc? I have searched <a href="http://schema.org" target="_blank">schema.org</a>, GoodRelations, and investigated using <a href="http://productontology.org" target="_blank">productontology.org</a>, but none seem to provide a means to define the property of product material. Wikipedia does not, for example, have a page for "glass vase", so it would seem that for that particular case, the productontology markup would not work. Unless the markup can somehow be extended? Does anyone have any thoughts or advice? It would be greatly appreciated. Thanks.<br>
>><br>
>> David<br>
>><br>
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><br>
><br>
> --------------------------------------------------------<br>
> martin hepp<br>
> e-business & web science research group<br>
> universitaet der bundeswehr muenchen<br>
><br>
> e-mail: <a href="mailto:hepp@ebusiness-unibw.org">hepp@ebusiness-unibw.org</a><br>
> phone: <a href="tel:%2B49-%280%2989-6004-4217" value="+498960044217">+49-(0)89-6004-4217</a><br>
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> www: <a href="http://www.unibw.de/ebusiness/" target="_blank">http://www.unibw.de/ebusiness/</a> (group)<br>
> <a href="http://www.heppnetz.de/" target="_blank">http://www.heppnetz.de/</a> (personal)<br>
> skype: mfhepp<br>
> twitter: mfhepp<br>
><br>
> Check out GoodRelations for E-Commerce on the Web of Linked Data!<br>
> =================================================================<br>
> * Project Main Page: <a href="http://purl.org/goodrelations/" target="_blank">http://purl.org/goodrelations/</a><br>
><br>
><br>
><br>
<br>
<br>
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End of goodrelations Digest, Vol 59, Issue 3<br>
********************************************<br>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><p><span style="font-size:10pt;font-family:Arial,sans-serif">Michael Uschold</span><span style="font-size:10pt;font-family:Arial,sans-serif"><br>
</span><span style="font-size:10pt;font-family:Arial,sans-serif">
Senior Ontology Consultant, Semantic Arts<br></span><span style="font-family:Arial,sans-serif;font-size:10pt"> </span><a href="http://www.semanticarts.com/" style="font-family:Arial,sans-serif;font-size:10pt" target="_blank">http://www.semanticarts.com</a><br>
<span style="font-size:10pt;font-family:Arial,sans-serif"> LinkedIn:</span><span style="font-size:10pt;font-family:Arial,sans-serif"> </span><span style="font-size:10pt;font-family:Arial,sans-serif"><a href="http://tr.im/limfu" style="color:rgb(87,151,176)" target="_blank">http://tr.im/limfu</a><font color="#5797b0"><br>
</font></span><span style="font-family:Arial,sans-serif;font-size:10pt"> Skype, Twitter: UscholdM</span></p><div><br></div><div><br></div>
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