sparql - Create data property XSD:string with Jena -


the problem sounds simple: create data property individual xsd:string in ontology.

i can create properties of xsd:datetime, xsd:float or xsd:int, if use xsd:string, untyped property!

i created minimal example, create ontology 1 class, 1 individual 2 data properties. datetime, works expected , 1 string, has no type in ontology.

i tried jena versions 3.4 , 3.0.1 , have no idea fix it.

package dataproperty;  import java.io.fileoutputstream; import org.apache.jena.datatypes.xsd.xsddatatype; import org.apache.jena.ontology.ontmodel; import org.apache.jena.rdf.model.modelfactory; import org.apache.jena.rdf.model.property; import org.apache.jena.rdf.model.resource; import org.apache.jena.rdf.model.resourcefactory;  public class dataproperty {  public static void main(string[] args) throws exception {     ontmodel model = modelfactory.createontologymodel();     string owlpath = "dataprop.owl";     try{         string ns = "http://www.example.org/ontology.owl#";     //create ontology            model.createclass(ns+"test");            resource r = model.createresource(ns+"test");            model.createindividual(ns+"indi1", r);            r = model.createresource(ns+"indi1");            model.createdatatypeproperty(ns+"name");            model.createdatatypeproperty(ns+"date");     //add data properties            property p = model.getproperty(ns+"name");            model.add(r, p, resourcefactory.createtypedliteral("myname", xsddatatype.xsdstring));            p = model.getproperty(ns+"date");            model.add(r, p, resourcefactory.createtypedliteral("2017-08-12t09:03:40", xsddatatype.xsddatetime));     //store ontology        fileoutputstream output = null;        output = new fileoutputstream(owlpath);        model.write(output);      }catch (exception e) {         system.out.println("error occured: " + e);         throw new exception(e.getmessage());     }   } }

it not untyped in rdf 1.1 - it's written in short form (better compatibility).

e.g. https://www.w3.org/tr/turtle/ section 2.5.1

"if there no datatype iri , no language tag, datatype xsd:string."


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