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Posted to users@jena.apache.org by François-Paul Servant <fr...@gmail.com> on 2014/12/17 00:18:24 UTC

JSON-LD, problem with numbers on a non-US system

Hi,

there is a problem when reading JSON-LD containing numbers on a non-US system. See a test program below. I found that this is caused by a bug in 
com.github.jsonldjava.core.RDFDataset
and I submitted an issue:
https://github.com/jsonld-java/jsonld-java/issues/131

Best,
fps

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;

import org.junit.Test;

import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;

public class NumbersOnNonUSSystemJsonLDBugTest {
@Test
public final void test() {
	try {
		InputStream is = new ByteArrayInputStream(jsonLDString().getBytes("UTF-8"));
		Model m = ModelFactory.createDefaultModel();
		m.read(is, null, "JSON-LD");
		m.write(System.out,"TTL");
		// on a French system, you get
		// WARN  org.apache.jena.riot - Lexical form '1,0E2' not valid for datatype http://www.w3.org/2001/XMLSchema#decimal
		// <http://www.ex.com/product>
		// 			<http://schema.org/price>  "1,0E2"^^<http://www.w3.org/2001/XMLSchema#decimal> .

	} catch (UnsupportedEncodingException e) { e.printStackTrace();}
}

String jsonLDString() {
	return 
			"{" +
	  "\"@id\": \"http://www.ex.com/product\"," +
	  "\"http://schema.org/price\": {" +
	    "\"@type\": \"http://www.w3.org/2001/XMLSchema#decimal\"," +
	    "\"@value\": 100.00" +
	  "}}}";
}
}

Re: JSON-LD, problem with numbers on a non-US system

Posted by Andy Seaborne <an...@apache.org>.
(conversation moved to jsonld-java/jsonld-java/issues/131 - more details 
there)

It is wrong for UK as well.  There are two problems.

The "1,0E2" is surface appearance.

The universal problem is the E -- a xsd:double.

Try with the 100.0 in "" -- @value is the lexical form.
http://www.w3.org/TR/json-ld/#typed-values

{
     "@id": "http://www.ex.com/product" ,
     "http://schema.org/price" : {
	"@type": "http://www.w3.org/2001/XMLSchema#decimal" ,
	"@value": "100.00"
	}
}

	Andy

On 16/12/14 23:18, François-Paul Servant wrote:
> Hi,
>
> there is a problem when reading JSON-LD containing numbers on a non-US system. See a test program below. I found that this is caused by a bug in
> com.github.jsonldjava.core.RDFDataset
> and I submitted an issue:
> https://github.com/jsonld-java/jsonld-java/issues/131
>
> Best,
> fps
>
> import java.io.ByteArrayInputStream;
> import java.io.InputStream;
> import java.io.UnsupportedEncodingException;
>
> import org.junit.Test;
>
> import com.hp.hpl.jena.rdf.model.Model;
> import com.hp.hpl.jena.rdf.model.ModelFactory;
>
> public class NumbersOnNonUSSystemJsonLDBugTest {
> @Test
> public final void test() {
> 	try {
> 		InputStream is = new ByteArrayInputStream(jsonLDString().getBytes("UTF-8"));
> 		Model m = ModelFactory.createDefaultModel();
> 		m.read(is, null, "JSON-LD");
> 		m.write(System.out,"TTL");
> 		// on a French system, you get
> 		// WARN  org.apache.jena.riot - Lexical form '1,0E2' not valid for datatype http://www.w3.org/2001/XMLSchema#decimal
> 		// <http://www.ex.com/product>
> 		// 			<http://schema.org/price>  "1,0E2"^^<http://www.w3.org/2001/XMLSchema#decimal> .
>
> 	} catch (UnsupportedEncodingException e) { e.printStackTrace();}
> }
>
> String jsonLDString() {
> 	return
> 			"{" +
> 	  "\"@id\": \"http://www.ex.com/product\"," +
> 	  "\"http://schema.org/price\": {" +
> 	    "\"@type\": \"http://www.w3.org/2001/XMLSchema#decimal\"," +
> 	    "\"@value\": 100.00" +
> 	  "}}}";
> }
> }
>
>