yes - when you give it an assembler file on the command line, it needs
to know which thing you are talking about and it does that via rdf:type.
There can be only one.
If you're calling assembler code directly, it's possible to set the
resource root - but in --desc there isn't this choice (e.g. Joseki)
Andy
On 01/02/11 14:43, Benson Margulies wrote:
Using the sparql command (and some trickery to get tdb into the classpath):
@prefix tdb:<http://jena.hpl.hp.com/2008/tdb#> .
@prefix rdfs:<http://www.w3.org/2000/01/rdf-schema#> .
@prefix rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ja:<http://jena.hpl.hp.com/2005/11/Assembler#> .
[] ja:loadClass "com.hp.hpl.jena.tdb.TDB" .
tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset .
tdb:GraphTDB rdfs:subClassOf ja:Model .
<#dataset> rdf:type tdb:DatasetTDB ;
tdb:location "/users/benson/data/1k_news.tdb" ;
.
<#dataset2> rdf:type tdb:DatasetTDB ;
tdb:location "/users/benson/data/1k_news.cleaned.tdb" ;
.
com.hp.hpl.jena.sparql.ARQException: More than one: var ?root
at
com.hp.hpl.jena.sparql.util.QueryExecUtils.getOne(QueryExecUtils.java:329)
at
com.hp.hpl.jena.sparql.util.graph.GraphUtils.findRootByType(GraphUtils.java:179)
at
com.hp.hpl.jena.sparql.core.assembler.AssemblerUtils.build(AssemblerUtils.java:80)
at arq.cmdline.ModAssembler.create(ModAssembler.java:55)
at
arq.cmdline.ModDatasetAssembler.createDataset(ModDatasetAssembler.java:31)
at
arq.cmdline.ModDatasetGeneralAssembler.createDataset(ModDatasetGeneralAssembler.java:21)
at arq.cmdline.ModDataset.getDataset(ModDataset.java:22)
at arq.query.getDataset(query.java:100)
at arq.query.queryExec(query.java:114)
at arq.query.exec(query.java:91)
at arq.cmdline.CmdMain.mainMethod(CmdMain.java:85)
at arq.cmdline.CmdMain.mainRun(CmdMain.java:47)
at arq.cmdline.CmdMain.mainRun(CmdMain.java:34)
at arq.query.main(query.java:49)
at arq.sparql.main(sparql.java:15)
