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The RDF 1.1 Literal Quiz

From: Richard Cyganiak <richard@cyganiak.de>
Date: Wed, 18 May 2011 19:22:17 +0100
Message-Id: <48033576-AB9B-410D-BF75-75B5C47CE288@cyganiak.de>
To: RDF Working Group WG <public-rdf-wg@w3.org>
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 .

Q2. Does this RDF graph (written in Turtle) have one triple?

 <a> <c> "foo" .
 <a> <c> "foo"^^xsd:string .

Q3. Is this be a valid Turtle file?

 <a> <b> "foo"^^rdf:PlainLiteral .

Q4. Is a parser allowed to unify "foo" and "foo"^^xsd:string into a single form while parsing?

Q5. Is this a valid N-Triples file?

 <a> <b> "foo" .

Q6. Is this a valid N-Triples file?

 <a> <b> "foo"^^rdf:PlainLiteral .

Q7. Is this a valid N-Triples file?

 <a> <b> "foo"@en .

Q8. Is this a valid N-Triples file?

 <a> <b> "foo"^^xsd:string .

Q9. Is this true in SPARQL?

 datatype("foo") == xsd:string

Q10. Is this true in SPARQL?

 datatype("foo") == error

Q11. Is this true in SPARQL?

 datatype("foo") == rdf:PlainLiteral

Q12. Is this true in SPARQL?

 datatype("foo"@en) == xsd:string

Q13. Is this true in SPARQL?

 datatype("foo"@en) == error

Q14. Is this true in SPARQL?

 datatype("foo"@en) == rdf:PlainLiteral

Q15. Is this true in SPARQL?

 datatype("foo"@en) == rdflang:en

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>

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>

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 . }

Q19. { <a> <b> "foo"^^xsd:string . } => { <a> <b> "foo" . }

Q20. { <a> <b> "foo" . } => { <a> <b> "foo"@en . }

Q21. { <a> <b> "foo"@en . } => { <a> <b> "foo" . }

Q22. { <a> <b> "foo"@en . } => { <a> <b> "foo"@en-GB . }

Q23. { <a> <b> "foo"@en-GB . } => { <a> <b> "foo"@en . }

Q24. { <a> <b> "foo"@fr . } => { <a> <b> "foo"@en . }
Received on Wednesday, 18 May 2011 18:22:46 GMT

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