By the way, only --set "arq:outputGraphBNodeLabels=true" works;
after insert
... ja:context
[ ja:cxtName "arq:outputGraphBNodeLabels" ;
ja:cxtValue "true" ] ;
to config file and restarting fuseki (1.0.0) outputs blank nodes as _:b0,
not as <_: ...>
Moreover, if I run fuseki-server with --config=config-inf-tdb.ttl --set
"arq:outputGraphBNodeLabels=true, it also ouputs as _:b0.
May be, this should be in other place?
Full config file in the end of letter.
2013/9/13 Andy Seaborne <[email protected]>
> On 12/09/13 14:52, Alexei Golovko wrote:
>
>> Is it possible to enable skolemization in Fuseki? I've found in mail
>> archive<http://mail-archives.**apache.org/mod_mbox/jena-dev/**
>> 201202.mbox/%**3CCAPTxtVMBy8JpJkkuYH0-**n2AwTiS-reN7Eur0w_01paRiu+A_**
>> [email protected]%3E<http://mail-archives.apache.org/mod_mbox/jena-dev/201202.mbox/%3ccaptxtvmby8jpjkkuyh0-n2awtis-ren7eur0w_01pariu+a...@mail.gmail.com%3E>
>> >that
>>
>> «Bnodes can be handled by enabling bNode label output, and using
>> <_:...> on input.»
>>
>> However, I couldn't find how to enable this blank node label output, or
>> use
>> it with default settings:
>> if I run
>> INSERT {
>> [<http://www.w3.org/1999/02/**22-rdf-syntax-ns#type<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>>
>> <
>> http://example.org/class>] . } WHERE {}
>> then SELECT-queries return inserted blank nodes as _:b0 or _:b2 (if query
>> result include or does not include other two blank nodes).
>>
>> I have seen an open issue https://issues.apache.org/**
>> jira/browse/JENA-193 <https://issues.apache.org/jira/browse/JENA-193>,
>> but status of each item is not clear for me.
>>
>>
> Alexei,
>
> Good question - by trail-and-error, and looking at the code, if you start
> the server with
>
> --set "arq:outputGraphBNodeLabels=**true"
>
> or have
>
> [] rdf:type fuseki:Server ;
> ja:context
> [ ja:cxtName "arq:outputGraphBNodeLabels" ;
> ja:cxtValue "true" ] ;
> ...
>
> it seems to partially works. The bnode labels returned (XML, JSON, TSV
> formats) are the internal ids but they are not in <_:...> form and so code
> needs to text mangle them. So there isn't consistent handling.
>
> It's server-wide, not per request.
>
> Seems like this needs cleaning up.
>
> Andy
>
> I updated JENA-193 in passing.
>
>
Modified config-inf-tdb.ttl:
# Licensed under the terms of http://www.apache.org/licenses/LICENSE-2.0
@prefix : <#> .
@prefix fuseki: <http://jena.apache.org/fuseki#> .
@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#> .
[] rdf:type fuseki:Server ;
ja:context [ ja:cxtName "arq:outputGraphBNodeLabels" ; ja:cxtValue
"true" ] ;
fuseki:services (
<#service1>
) .
# Custom code.
[] ja:loadClass "com.hp.hpl.jena.tdb.TDB" .
# TDB
tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset .
tdb:GraphTDB rdfs:subClassOf ja:Model .
## ---------------------------------------------------------------
## Service with only SPARQL query on an inference model.
## Inference model bbase data in TDB.
<#service1> rdf:type fuseki:Service ;
fuseki:name "inf" ; # http://host/inf
fuseki:serviceQuery "sparql" ; # SPARQL query service
fuseki:serviceUpdate "update" ;
fuseki:dataset <#dataset> ;
.
<#dataset> rdf:type ja:RDFDataset ;
ja:defaultGraph <#model_inf> ;
.
<#model_inf> a ja:InfModel ;
ja:baseModel <#tdbGraph> ;
ja:reasoner [
#ja:reasonerURL <http://jena.hpl.hp.com/2003/OWLFBRuleReasoner>
ja:reasoner [ja:reasonerClass
"org.mindswap.pellet.jena.PelletReasonerFactory"]
] .
<#tdbDataset> rdf:type tdb:DatasetTDB ;
tdb:location "DB" ;
# If the unionDefaultGraph is used, then the "update" service should be
removed.
# The unionDefaultGraph is read only.
# tdb:unionDefaultGraph true ;
.
<#tdbGraph> rdf:type tdb:GraphTDB ;
tdb:dataset <#tdbDataset> .
