Hi Yana,
Thank you for the report. Poking around, I found that writing then
reading your data through JSON-LD leads to alteration of the data,
presumably due to the @id you highlighted.
I've raised a Jena JIRA issue; Jena uses the java-jsonld:java-jsonld
engine to handled JSON-LD and I don't see any part of the Jena code
being sensitive to the empty URI - I wonder if there is some interaction
with "@base" and "@prefix :" as well as the "@id" : "./". I created an
issue for java-jsonld with test cases.
https://issues.apache.org/jira/browse/JENA-758
==>
https://github.com/jsonld-java/jsonld-java/issues/122
and test case:
https://gist.github.com/afs/6474bd26a5e9f4c9aeb7#file-jsonld-java-issue-122
Andy
On 05/08/14 22:05, Yana Panchenko wrote:
Hi,
There seems to be a problem with writing Dataset into JSON-LD in a case such as
the following. TRIG input
@prefix : <http://www.example.com/resource/100/v1#> .
@prefix dc: <http://purl.org/dc/elements/1.1/> .
:G {
<http://www.example.com/archive/100/v1> dc:isVersionOf
<http://www.example.com/resource/100> .
}
is read into Dataset and then written in JSON-LD. The resulting JSON-LD looks
like this:
{
"@graph" : [ {
"@id" : "../../archive/100/v1",
"dc:isVersionOf" : {
"@id" : "./"
}
} ],
"@id" : ":G",
"@context" : {
"dc" : "http://purl.org/dc/elements/1.1/";,
"@base" : "http://www.example.com/resource/100/v1#";,
"" : "http://www.example.com/resource/100/v1#";
}
}
The fifth line in this JSON-LD is wrong. The problem occurs if a resource uri
in a graph is the first part of the base uri (with empty string prefix).Is it a
bug? Or is it not correct to have an empty string prefix? (if I change prefix
':' to e.g. 'v1:' everything works fine, but at the same time the empty prefix
works fine for e.g. TRIG)
My read TRIG and write JSON-LD code:
InputStream is = this.getClass().getResourceAsStream(RESOURCE_FILE);
Dataset dataset = DatasetFactory.createMem();
RDFDataMgr.read(dataset, is, RDFFormat.TRIG.getLang());
is.close();
sw = new StringWriter();
RDFDataMgr.write(sw, dataset, RDFFormat.JSONLD);
System.out.println(sw.toString());
Kind regards,
Yana
