This is the archive of the goodrelations dicussion list

Hi Yves,

on

    http://groups.google.com/group/music-ontology-specification-group/browse_thread/thread/78079360a41aa611/7cacc208166ab535

you state that

 >OK - after taking a quick look at:
 >http://www.heppnetz.de/ontologies/goodrelations/goodrelations-UML.png

 >It looks like there is indeed a gr:owns property - but using it on an
 >artist would mean it is a 'business entity' - which I am sure many
 >artists would disagree with :-)

Note that being a gr:BusinessEntity basically just means you are a  
foaf:Agent who offers or consumes something. Every human being is thus  
a gr:BusinessEntity, and every organization. Even the pope is a  
gr:BusinessEntity in the sense of GoodRelations, as far as he is a  
human being. Even marsmen or animals sufficiently intelligent to act  
willfully could be considered a gr:BusinessEntity-

So no musician has reason to worry about being classified as a  
gr:BusinessEntity. GoodRelations does not assume you want an amount of  
money for your offer (you can say that something is free using a  
gr:UnitPriceSpecification of zero EUR e.g.), nor that the compensation  
must be in money.

In theory, you could e.g. define a class

   foo:NonMonetaryCompensation a owl:Class .

and a property

   foo:compensation a owl:ObjectProperty ;

	rdfs:domain gr:Offering ;

	rdfs:range foo:NonMonetaryCompensation .

and then define instances like

   foo:GoodKarma a foo:NonMonetaryCompensation .

   foo:ASmile a foo:NonMonetaryCompensation .

The you can simply say



foo:Offer a gr:Offering .

	gr:includes foo:MySong ;

	gr:availableDeliveryMethods gr:DeliveryModeDirectDownload .

	foo:compensation foo:ASmile .



foo:MySong a gr:ProductOrServicesSomeInstancesPlaceholder, foo:Song .

	# add properties characterizing the song here



The problem with using gr:owns in your case is in the fact that  
gr:owns says that the musician owns a certain instrument, which does  
not imply anything about his ability to play it. I may own a violin as  
an investment object. Also, someone may not own a certain instrument,  
yet still be an excellent performer on that type of instrument.



Best



Martin