I want to use prefix to represent this nt file:
<www.test.com/a/yan-dang-shan> <www.test.com/a/zhongwenming> <www.test.com/a/yan-dang-shan> .
<www.test.com/a/yan-dang-shan> <http://www.w3.org/2000/01/rdf-schema#label> "a" .
<www.test.com/a/zhongwenming> <http://www.w3.org/2000/01/rdf-schema#label> "b" .
<www.test.com/a/yan-dang-shan> <http://www.w3.org/2000/01/rdf-schema#label> "c" .
What I write into a new nt file is:
@prefix sp: <www.test.com/a/> .
<sp:yan-dang-shan> <sp:zhongwenming> <sp:yan-dang-shan> .
<sp:yan-dang-shan> <http://www.w3.org/2000/01/rdf-schema#label> "a" .
<sp:zhongwenming> <http://www.w3.org/2000/01/rdf-schema#label> "b" .
<sp:yan-dang-shan> <http://www.w3.org/2000/01/rdf-schema#label> "c" .
But when I use this to sparql in cmd:
SELECT ?x ?y ?z
WHERE
{ ?x ?y ?z . }
There is an error showed in cmd:
D:\>sparql --data=ceshi.nt --query=ceshi.rq
11:01:42 ERROR riot :: [line: 1, col: 1 ] Expected BNode or IRI:
Got: [DIRECTIVE:prefix]
Failed to load data
I also tried this:
@prefix sp: <www.test.com/a/> .
sp:yan-dang-shan sp:zhongwenming sp:yan-dang-shan .
sp:yan-dang-shan <http://www.w3.org/2000/01/rdf-schema#label> "a" .
sp:zhongwenming <http://www.w3.org/2000/01/rdf-schema#label> "b" .
sp:yan-dang-shan <http://www.w3.org/2000/01/rdf-schema#label> "c" .
But it report the same error which I don't know how to fix it.
How should I revise to make it ok?
Any help will be appreciated. Thanks!
N-triples does not have prefixes.
Turtle has prefixes. Try putting your data in a file with extension ".ttl".
You can test your data with the command line tool riot.