Thank for the answer ANdy, but it only change the error to : Exception in thread "main" com.hp.hpl.jena.assembler.exceptions.NoSpecificTypeException: the root <http://www.thesis_project.org#spatial_dataset> has no most specific type that is a subclass of ja:Object at com.hp.hpl.jena.assembler.assemblers.AssemblerGroup$PlainAssemblerGroup.open(AssemblerGroup.java:113) at com.hp.hpl.jena.assembler.assemblers.AssemblerGroup$ExpandingAssemblerGroup.open(AssemblerGroup.java:81) at com.hp.hpl.jena.assembler.assemblers.AssemblerBase.open(AssemblerBase.java:52) at com.hp.hpl.jena.assembler.assemblers.AssemblerBase.open(AssemblerBase.java:48) at com.hp.hpl.jena.query.DatasetFactory.assemble(DatasetFactory.java:267) at com.hp.hpl.jena.query.DatasetFactory.assemble(DatasetFactory.java:242)
It seems that it's an assembler relative problem/ Considering this error message I read the documentation about assembler (Assembler quicksart/Assembler How to/inside assembler). It seems strange that I get this error message that inform me that my spatial dataset hasn't any specific type because as far as I understand assembler definition, this line of my config file : :spatial_dataset rdf:type spatial:SpatialDataset ; specify that it is a "spatial:SpatialDataset", and so is more specific than just a generic object. Did I miss mandatory properties that must be used ? And also, do the spatial assembler has its own description ? I searched for a while about "http://jena.apache.org/spatial#"; and dont find anything. I suppose so that this is only a link to a pure java class that is invoke behind the scene. VAISSE-LESTEVEN Arthur. ________________________________ De : Andy Seaborne <[email protected]> À : "[email protected]" <[email protected]>; Arthur Vaïsse-Lesteven <[email protected]> Envoyé le : Jeudi 10 juillet 2014 19h29 Objet : Re: Jena Spatial - How to create a SpatialDataset Inline ... On 10 July 2014 16:42, Arthur Vaïsse-Lesteven <[email protected]> wrote: > Hi everyone, > I present you my apologies in advance for the long text. > > I searched for a while before asking to the mailing list how to instantiate a > SpatialDataset, but I still fail my attempts of doing it. > > > Here is my problem : I have some RDF data with some that are localized geographically. > Here come an extract of RDF(N-TRIPLES) data that I have : > ... > And I use the following config.ttl file : > __________________________________________________________________________________________________________________ > ## A config based on the example furnished with the tutorial at > http://jena.apache.org/documentation/query/spatial-query.html > @prefix : <http://www.thesis_project.org#> . > @prefix rdf: > <http://www.w3.org/1999/02/22-rdf-syntax-ns#> . > @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> . > @prefix tdb: <http://jena.hpl.hp.com/2008/tdb#> . > @prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> . > @prefix spatial: <http://jena.apache.org/spatial#> . > @prefix wgs: <http://www.w3.org/2003/01/geo/wgs84_pos#> > > # TDB > [] ja:loadClass "com.hp.hpl.jena.tdb.TDB" . > tdb:DatasetTDB rdfs:subClassOf > ja:RDFDataset . > tdb:GraphTDB rdfs:subClassOf ja:Model . > > # Spatial > [] ja:loadClass "org.apache.jena.query.spatial.SpatialQuery" . > spatial:SpatialtDataset rdfs:subClassOf ja:RDFDataset . Typo - not "SpatialtDataset" - but "SpatialDataset" (there is an extra "t" before "D" in your config file) I'm not in a position to test this but it does correlate to the error. > spatial:SpatialIndexLucene rdfs:subClassOf spatial:SpatialIndex . > > ## --------------------------------------------------------------- > :spatial_dataset rdf:type spatial:SpatialDataset ; > spatial:dataset <#dataset> ; > > spatial:index <#indexLucene> ; > . > > <#dataset> rdf:type tdb:DatasetTDB ; > tdb:location "--mem--" ; > > tdb:unionDefaultGraph true ; > . > > <#indexLucene> a spatial:SpatialIndexLucene ; > #spatial:directory <file:Lucene> ; > spatial:directory "mem" ; > spatial:definition <#definition> ; > . > > <#definition> a spatial:EntityDefinition ; > spatial:entityField "uri" ; > spatial:geoField "geo" ; > # custom geo predicates for 1) Latitude/Longitude > Format > spatial:hasSpatialPredicatePairs ([ spatial:latitude wgs:lat ; >spatial:longitude wgs:long ]) ; > . > __________________________________________________________________________________________________________________ > > I really don't understand what I'm missing. > As far as > I understood, the process consist in : > - create an index model ( here the standard one that use wsg84 lat/long >properties of resources )[#3] > - define a binding between model attributes and RDF properties using the >configuration file [#1] > - build a dataset that contains resources compliant with the index >previously defined (loading my RDF data into a Model) + the binding[#2] > > - give a storage space for the spatial index ( a "in memory" one in my >case)[#4] > - fill the index the entity of the dataset[#5] > > But This code fail with the following error : > > Exception in thread "main" > com.hp.hpl.jena.assembler.exceptions.NoSpecificTypeException: the root > <http://www.thesis_project.org#spatial_dataset> has no most > specific type that is a subclass of ja:Object > at com.hp.hpl.jena.assembler.assemblers.AssemblerGroup$PlainAssemblerGroup.open(AssemblerGroup.java:113) > at >com.hp.hpl.jena.assembler.assemblers.AssemblerGroup$ExpandingAssemblerGroup.open(AssemblerGroup.java:81) > at >com.hp.hpl.jena.assembler.assemblers.AssemblerBase.open(AssemblerBase.java:52) > at >com.hp.hpl.jena.assembler.assemblers.AssemblerBase.open(AssemblerBase.java:48) > at > com.hp.hpl.jena.query.DatasetFactory.assemble(DatasetFactory.java:267) > at com.hp.hpl.jena.query.DatasetFactory.assemble(DatasetFactory.java:242) > at Main.main(Main.java:30) > > I don't understand this error. Could someone explain me what is wrong in this > "minimal" use case ? > > Sincerely, > VAISSE-LESTEVEN Arthur.
