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i've found a web page that explain different between relations.

https://www.w3.org/2004/08/12-Yoshio/onNaryRelations.html#unary

but that missing part of code, i can't make any of them work.

how possible to make it works like "John swims"?

crapthings
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  • in OWL you have either unary or binary relations. That means, an individual is asserted to a class or to another individual by some property. So, what is "swims"? of it's a property you'll need an object. if it's an object, you'll need a property, e.g. "can" or something generic. – UninformedUser Jul 24 '18 at 10:04

1 Answers1

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Important note: your link does not show actual RDF. As stated in the abstract of the page:

This page presents my (ongoing) proposal for a framework for presenting N-ary relationships.

Instead, my answer will show you how to define the necessary classes and properties to express what you are trying to.

RDF only allows to define statements, or triples, with a subject, a predicate and an object.

<subject> <predicate> <object>
        I        like hamburgers
     John          is swimming

An important predicate is rdf:type (often shortened to a in Turtle files, such as the one your links shows), which indicates that an individual is an instance of a certain class. To read it in actual English, you can use "is a".

<subject> <predicate> <object>
        I        am a Person
     John        is a Person
 Swimming       is an Activity

Last but not least, in order to express that a Person performs an activity, we need to define an object property, performs, which has Person as a domain and Activity as a range.

In this Gist, you'll find a Turtle file that you can open in Protégé. The important line here is line 40, where the actual John performs Swimming statement is defined.

Richard-Degenne
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