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Would it be correct to say the following should be added to the description of classes and subclasses:
foaf:Person rdf:Class rdf:Class
? If I got it right... --Dan|(talk) 15:23, 11 January 2010 (UTC)
This is a very old question, but just for closure, the triple that fits in this case is:
foaf:Person rdf:type rdf:Class
However it is not necessary to add this to the description because it is entailed by
ex:John rdf:type foaf:Person
because the rdfs:range of rdf:type is rdf:Class. — Preceding unsigned comment added by Greentaratoo (talk • contribs) 18:48, 3 March 2016 (UTC)
In the article, there is "rdf:XMLLiteral – the class of XML literal values. rdf:XMLLiteral is an instance of rdfs:Datatype (and thus a subclass of rdfs:Literal)." I think this should be replaced to "rdf:XMLLiteral – the class of XML literal values. rdf:XMLLiteral is an instance of rdfs:Datatype and a subclass of rdfs:Literal". Thre reason: looking at [1] rdf:XMLLiteral is an instance of rdfs:Datatype and a subclass of rdfs:Literal and according to [2] rdfs:Datatype is an instance of rdfs:Class and a subclass of rdfs:Class.
[1] http://www.w3.org/1999/02/22-rdf-syntax-ns [2] http://www.w3.org/2000/01/rdf-schema — Preceding unsigned comment added by Chrdebru (talk • contribs) 07:29, 12 January 2011 (UTC)
Just out of curiosity, isn't the definition of "Dog1" as a type of "Animal" incorrect? Dog1 is an example of an animal, but not a type. Art2welp (talk) 04:41, 12 February 2016 (UTC)
rdf:type
of "Dog1" is "animal", but that's not the same thing (as you note, it just means that Dog1 is an example of an animal). On the other paw, "cat" is defined as "a type of animal" using rdfs:subClassOf
. Andy Dingley (talk) 19:13, 12 February 2016 (UTC)Yes ... and "cat1" is an rdf:type of "cat," which is a subClassOf "animal." I was really just trying to point out that rdf:type isn't very clearly defined, if that hierarchy isn't enforced. Perhaps we can add "cat1 rdf:type animal" to the example to at least illustrate that polyhierarchy. Art2welp (talk) 21:11, 17 February 2016 (UTC)
There is no concept of "well-formed graph" defined in either the RDF or RDFS specification. Really there is nothing "ill-formed" about the graph in the example in the RDFS entailment section. If a property has a certain range (say ex:animal) and there is a triple that uses that predicate with a certain object (say ex:cat2), then under the RDFS entailment regime, one may infer that ex:cat2 rdf:type ex:animal. No "guessing" is needed or expected - this is just what RDFS entailment means. There is nothing in the graph to indicate that ex:cat is a subclass of ex:animal. Maybe that is what intended (e.g. "cat" stands for Caterpillar tractor) - that doesn't make the graph not "well-formed", whatever that means. There is no source given for this section, so I don't know where this material, or this "well-formed" concept - came from - certainly not from the RDFS specification itself. --Greentaratoo (talk) 01:55, 3 March 2016 (UTC
--Greentaratoo (talk) 02:06, 3 March 2016 (UTC)
Fine, what do suggest as secondary and tertiary sources - SPARQL? That's the origin of the term "RDFS entailment regime", so its a primary source.--Greentaratoo (talk) 03:08, 3 March 2016 (UTC)
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It seems just a bit weird that LIS is given as the acronym, but only "information science" is within the double quotes, while 'library and' is outside of them. Toddcs (talk) 20:24, 7 October 2023 (UTC)