On 19/06/12 01:21, Rob Vesse wrote:
I don't believe that literals are valid as predicates in RDF but also I
don't believe TDB enforces any restrictions on what kind of Nodes can be
stored.
Strictly speaking those should be invalid triples and in principal a
SPARQL Update engine should refuse to insert them but I may be
interpreting the spec wrong.
Andy can probably answer the question better than I can
Illegal triples are supposed to be (silently) skipped (c.f. CONSTRUCT).
I tried this with the latest release:
PREFIX : <http://ex/>
CLEAR ;
INSERT DATA { :s :p "1" } ;
INSERT { ?s ?o "2" } WHERE { ?s ?p ?o } ;
INSERT { ?s ?p "99" } WHERE { ?s ?p ?o } ;
and
arq.update --file U.ru --dump
to get:
<http://ex/s> <http://ex/p> "99" .
<http://ex/s> <http://ex/p> "1" .
which looks right to me.
See Quad.isLegalAsData()
Andy
Rob
On 6/18/12 5:12 PM, "Tim Harsch"<[email protected]> wrote:
Not sure what I am seeing here. Is it OK for literal's to be predicates
in this case?
1) Start up Fuseki-0.2.1 incubating
2) load books.ttl
3) run this
PREFIX dc:<http://purl.org/dc/elements/1.1/>
INSERT {
?s ?c 1
}
WHERE {
?s dc:title ?c .
}
4) run this (notice literal as predicate)
--------------------------------------------------------------------------
-------------------------------------------------------
| s | p
| o |
==========================================================================
=======================================================
|<http://example.org/book/book5> | "Harry Potter and the Order of the
Phoenix" | 1 |
|<http://example.org/book/book5> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Order of the Phoenix" |
|<http://example.org/book/book5> |
<http://purl.org/dc/elements/1.1/creator> | "J.K. Rowling"
|
|<http://example.org/book/book3> | "Harry Potter and the Prisoner Of
Azkaban" | 1 |
|<http://example.org/book/book3> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Prisoner Of Azkaban" |
|<http://example.org/book/book3> |
<http://purl.org/dc/elements/1.1/creator> | _:b0
|
| _:b1 |
<http://www.w3.org/2001/vcard-rdf/3.0#Family> | "Rowling"
|
| _:b1 |
<http://www.w3.org/2001/vcard-rdf/3.0#Given> | "Joanna"
|
|<http://example.org/book/book1> | "Harry Potter and the Philosopher's
Stone" | 1 |
|<http://example.org/book/book1> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Philosopher's Stone" |
|<http://example.org/book/book1> |
<http://purl.org/dc/elements/1.1/creator> | "J.K. Rowling"
|
|<http://example.org/book/book6> | "Harry Potter and the Half-Blood
Prince" | 1 |
|<http://example.org/book/book6> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Half-Blood Prince" |
|<http://example.org/book/book6> |
<http://purl.org/dc/elements/1.1/creator> | "J.K. Rowling"
|
|<http://example.org/book/book4> | "Harry Potter and the Goblet of Fire"
| 1 |
|<http://example.org/book/book4> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Goblet of Fire" |
| _:b0 |
<http://www.w3.org/2001/vcard-rdf/3.0#FN> | "J.K. Rowling"
|
| _:b0 |
<http://www.w3.org/2001/vcard-rdf/3.0#N> | _:b1
|
|<http://example.org/book/book2> | "Harry Potter and the Chamber of
Secrets" | 1 |
|<http://example.org/book/book2> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Chamber of Secrets" |
|<http://example.org/book/book2> |
<http://purl.org/dc/elements/1.1/creator> | _:b0
|
|<http://example.org/book/book7> | "Harry Potter and the Deathly
Hallows" | 1 |
|<http://example.org/book/book7> |
<http://purl.org/dc/elements/1.1/title> | "Harry Potter and the
Deathly Hallows" |
|<http://example.org/book/book7> |
<http://purl.org/dc/elements/1.1/creator> | "J.K. Rowling"
|
--------------------------------------------------------------------------
-------------------------------------------------------
