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Re: The RDF 1.1 Literal Quiz

From: Ivan Herman <ivan@w3.org>
Date: Thu, 19 May 2011 17:01:06 +0200
Cc: public-rdf-wg@w3.org
Message-Id: <3E6A1E6B-91A7-49F0-92AA-068FB5C8ABEC@w3.org>
To: antoine.zimmermann@insa-lyon.fr

On May 19, 2011, at 16:51 , Antoine Zimmermann wrote:

> I have some more questions:
> 
> 
> 
> Q25. Is this a single triple?
> 
>    <joe> <nbChildren> "2"^^xs:decimal .
>    <joe> <nbChildren> "+2.000"^^xs:decimal .
> 

That is D-entailment. Ie, with D-E yes, otherwise no


> Q26. Is this a single triple?
> 
>    <joe> <nbChildren> "2"^^xs:byte .
>    <joe> <nbChildren> "2"^^xs:positiveInteger .

No by default. RDF Semantics does not (automatically) include subclassing in the RDF sense for the datatype classes whose lexical spaces are subsets. Implementations may add that.

> 
> Q27. Does the following query give <joe> as an answer, when asked against the previous graphs?
> 
>    SELECT ?person WHERE { ?person <nbChildren> 2 }

Isn't 2 a shortcut for "2"^^xs:decimal?

> 
> 
> 
> Regards,
> AZ.
> 
> Le 19/05/2011 16:40, Alex Hall a écrit :
>> On Wed, May 18, 2011 at 2:22 PM, Richard Cyganiak<richard@cyganiak.de>wrote:
>> 
>>> The RDF 1.1 Literal Quiz
>>> ------------------------
>>> 
>>> Let's pretend we live in the future and RDF 1.1 has just been published,
>>> including this working group's attempt to clean up string literals.
>>> 
>>> Now here's a quiz with some RDF trivia questions.
>>> 
>>> What are the answers that you'd like to see? Please keep them short --
>>> along the lines of “Yes”, “No”, “Don't care”, “Don't prefer but ok”, “Oh yes
>>> please please please”, “WTF!?!?”, “Formal objection!”
>>> 
>>> (I tried to phrase the questions in terms of user-visible behaviour and not
>>> spec-internal mechanisms. I hope we can get some non-controversial test
>>> cases out of this, and pinpoint where we disagree on desired behaviour. If
>>> you provide responses, then feel free to add additional questions.)
>>> 
>>> 
>>> 
>>> Q1. Does this RDF graph (written in Turtle) have one triple?
>>> 
>>>  <a>  <b>  1 .
>>>  <a>  <b>  "1"^^xsd:integer .
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q2. Does this RDF graph (written in Turtle) have one triple?
>>> 
>>>  <a>  <c>  "foo" .
>>>  <a>  <c>  "foo"^^xsd:string .
>>> 
>> 
>> Yes - I thought the whole point of this exercise was to enforce that by
>> settling on a single representation for that in the abstract syntax.
>> 
>> 
>>> 
>>> Q3. Is this be a valid Turtle file?
>>> 
>>>  <a>  <b>  "foo"^^rdf:PlainLiteral .
>>> 
>> 
>> Valid Turtle, invalid RDF.
>> 
>> 
>>> 
>>> Q4. Is a parser allowed to unify "foo" and "foo"^^xsd:string into a single
>>> form while parsing?
>>> 
>> 
>> Yes, and hopefully required to.
>> 
>> 
>>> 
>>> Q5. Is this a valid N-Triples file?
>>> 
>>>  <a>  <b>  "foo" .
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q6. Is this a valid N-Triples file?
>>> 
>>>  <a>  <b>  "foo"^^rdf:PlainLiteral .
>>> 
>> 
>> Valid N-Triples, invalid RDF.
>> 
>> 
>>> 
>>> Q7. Is this a valid N-Triples file?
>>> 
>>>  <a>  <b>  "foo"@en .
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q8. Is this a valid N-Triples file?
>>> 
>>>  <a>  <b>  "foo"^^xsd:string .
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q9. Is this true in SPARQL?
>>> 
>>>  datatype("foo") == xsd:string
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q10. Is this true in SPARQL?
>>> 
>>>  datatype("foo") == error
>>> 
>> 
>> No.
>> 
>> 
>>> 
>>> Q11. Is this true in SPARQL?
>>> 
>>>  datatype("foo") == rdf:PlainLiteral
>>> 
>> 
>> I hope not.
>> 
>> 
>>> 
>>> Q12. Is this true in SPARQL?
>>> 
>>>  datatype("foo"@en) == xsd:string
>>> 
>> 
>> Probably not.
>> 
>> 
>>> 
>>> Q13. Is this true in SPARQL?
>>> 
>>>  datatype("foo"@en) == error
>>> 
>> 
>> Don't care.
>> 
>> 
>>> 
>>> Q14. Is this true in SPARQL?
>>> 
>>>  datatype("foo"@en) == rdf:PlainLiteral
>>> 
>> 
>> Don't care.
>> 
>> 
>>> 
>>> Q15. Is this true in SPARQL?
>>> 
>>>  datatype("foo"@en) == rdflang:en
>>> 
>> 
>> Don't care.
>> 
>> 
>>> 
>>> Q16. Does the literal in this RDF/XML fragment have a language tag?
>>> 
>>>  <rdf:Description rdf:about="a" xml:lang="en">
>>>   <rdf:b>foo</rdf:b>
>>>  </rdf:Description>
>>> 
>> 
>> Don't care.
>> 
>> 
>>> 
>>> Q17. Does the literal in this RDF/XML fragment have a language tag?
>>> 
>>>  <rdf:Description rdf:about="a" xml:lang="en">
>>>   <rdf:b rdf:datatype="&xsd;string">foo</rdf:b>
>>>  </rdf:Description>
>>> 
>> 
>> Don't care.
>> 
>> 
>>> 
>>> For each of the following pairs of statements, if the statement on the left
>>> is true, then is the statement on the right true as well in a system that
>>> supports datatype inference (specifically, {xsd:string}-Entailment)?
>>> 
>>> Q18. {<a>  <b>  "foo" . } =>  {<a>  <b>  "foo"^^xsd:string . }
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q19. {<a>  <b>  "foo"^^xsd:string . } =>  {<a>  <b>  "foo" . }
>>> 
>> 
>> Yes.
>> 
>> 
>>> 
>>> Q20. {<a>  <b>  "foo" . } =>  {<a>  <b>  "foo"@en . }
>>> 
>> 
>> No.
>> 
>> 
>>> 
>>> Q21. {<a>  <b>  "foo"@en . } =>  {<a>  <b>  "foo" . }
>>> 
>> 
>> No.
>> 
>> 
>>> 
>>> Q22. {<a>  <b>  "foo"@en . } =>  {<a>  <b>  "foo"@en-GB . }
>>> 
>> 
>> No.
>> 
>> 
>>> 
>>> Q23. {<a>  <b>  "foo"@en-GB . } =>  {<a>  <b>  "foo"@en . }
>>> 
>> 
>> No.
>> 
>> 
>>> 
>>> Q24. {<a>  <b>  "foo"@fr . } =>  {<a>  <b>  "foo"@en . }
>>> 
>> 
>> 
>> No.
>> 
>> -Alex
>> 
> 
> 
> -- 
> Antoine Zimmermann
> Researcher at:
> Laboratoire d'InfoRmatique en Image et Systèmes d'information
> Database Group
> 7 Avenue Jean Capelle
> 69621 Villeurbanne Cedex
> France
> Tel: +33(0)4 72 43 61 74 - Fax: +33(0)4 72 43 87 13
> Lecturer at:
> Institut National des Sciences Appliquées de Lyon
> 20 Avenue Albert Einstein
> 69621 Villeurbanne Cedex
> France
> antoine.zimmermann@insa-lyon.fr
> http://zimmer.aprilfoolsreview.com/
> 


----
Ivan Herman, W3C Semantic Web Activity Lead
Home: http://www.w3.org/People/Ivan/
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Received on Thursday, 19 May 2011 14:59:17 GMT

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