Hi All, 1. Triplestore
I have an existing Triplestore that I setup by putting data in Fuseki. I used Java code to put all triples in Fuseki (here is url that I used - http://localhost:3030/mydb/data). Before starting loading of data I start Fuseki with this command: fuseki-server --update --loc=/tmp/fuseki-tdb /mydb (on Mac OS X). My database is located at /tmp/fuseki-tdb This setup works well and I can query all triples from console. 2. Free Text Search I need to setup free text search on top of this Triplestore, so that normal Sparql queries and free text queries are both possible. Here is the assembler file that I used. @prefix : <http://mydb.com/ns/dataset#> . @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 text: <http://jena.apache.org/text#> . @prefix fuseki: <http://jena.apache.org/fuseki#> . @prefix no: <http://mydb.com/ns/concepts#> . @prefix d: <http://mydb.com/ns/data#> . ## Example of a TDB dataset and text index ## Initialize TDB [] ja:loadClass "com.hp.hpl.jena.tdb.TDB" . tdb:DatasetTDB rdfs:subClassOf ja:RDFDataset . tdb:GraphTDB rdfs:subClassOf ja:Model . ## Initialize text query [] ja:loadClass "org.apache.jena.query.text.TextQuery" . # A TextDataset is a regular dataset with a text index. text:TextDataset rdfs:subClassOf ja:RDFDataset . # Lucene index text:TextIndexLucene rdfs:subClassOf text:TextIndex . # Solr index text:TextIndexSolr rdfs:subClassOf text:TextIndex . ## --------------------------------------------------------------- ## This URI must be fixed - it's used to assemble the text dataset. :text_dataset rdf:type text:TextDataset ; text:dataset <#dataset> ; text:index <#indexLucene> ; . # A TDB datset used for RDF storage <#dataset> rdf:type tdb:DatasetTDB ; tdb:location “/tmp/fuseki-tdb" ; tdb:unionDefaultGraph true ; # Optional . # Text index description <#indexLucene> a text:TextIndexLucene ; text:directory <file:Lucene> ; ##text:directory "mem" ; text:entityMap <#entMap> ; . # Mapping in the index # URI stored in field "uri" # rdfs:label is mapped to field "text" <#entMap> a text:EntityMap ; text:entityField "uri" ; text:defaultField "text" ; text:map ( [ text:field "text" ; text:predicate no:name ] [ text:field "text" ; text:predicate no:alt-name ] [ text:field "text" ; text:predicate no:name ] [ text:field "text" ; text:predicate no:title ] [ text:field "text" ; text:predicate no:author ] [ text:field "text" ; text:predicate no:inventor ] ) . [] rdf:type fuseki:Server ; # Server-wide context parameters can be given here. # For example, to set query timeouts: on a server-wide basis: # Format 1: "1000" -- 1 second timeout # Format 2: "10000,60000" -- 10s timeout to first result, then 60s timeout to for rest of query. # See java doc for ARQ.queryTimeout # ja:context [ ja:cxtName "arq:queryTimeout" ; ja:cxtValue "10000" ] ; # Load custom code (rarely needed) # ja:loadClass "your.code.Class" ; # Services available. Only explicitly listed services are configured. # If there is a service description not linked from this list, it is ignored. fuseki:services ( <#service> #<#service_text_tdb> ) . <#service> rdf:type fuseki:Service ; fuseki:name “mydb" ; # http://host:port/tdb fuseki:serviceQuery "query" ; # SPARQL query service fuseki:serviceQuery "sparql" ; # SPARQL query service fuseki:serviceUpdate "update" ; # SPARQL query service fuseki:serviceUpload "upload" ; # Non-SPARQL upload service fuseki:serviceReadWriteGraphStore "data" ; # SPARQL Graph store protocol (read and write) fuseki:dataset <#dataset> ; fuseki:dataset :text_dataset ; . With this assembler file, I start my server with following command, fuseki-server --update --desc=/Users/kamb16/projects/nano/data/fuseki-assembler.ttl /mydb I get following error, com.hp.hpl.jena.sparql.ARQException: Found two matches: var ?root -> http://mydb.com/ns/dataset#text_dataset, file:///tmp/fuseki-assembler.ttl#dataset at com.hp.hpl.jena.sparql.util.QueryExecUtils.getOne(QueryExecUtils.java:360) at com.hp.hpl.jena.sparql.util.graph.GraphUtils.findRootByType(GraphUtils.java:194) at com.hp.hpl.jena.sparql.core.assembler.AssemblerUtils.build(AssemblerUtils.java:91) at arq.cmdline.ModAssembler.create(ModAssembler.java:68) at arq.cmdline.ModDatasetAssembler.createDataset(ModDatasetAssembler.java:43) at org.apache.jena.fuseki.FusekiCmd.processModulesAndArgs(FusekiCmd.java:307) at arq.cmdline.CmdArgModule.process(CmdArgModule.java:50) at arq.cmdline.CmdMain.mainMethod(CmdMain.java:101) at arq.cmdline.CmdMain.mainRun(CmdMain.java:63) at arq.cmdline.CmdMain.mainRun(CmdMain.java:50) at org.apache.jena.fuseki.FusekiCmd.main(FusekiCmd.java:166) I do not understand how to fix this issue. Could you please help? I want to do regular Sparql queries as well as Free text search. Regards, Ajay
