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• Can't get RDFlib to work on windows

  - by john

  I have installed RDFlib 3.0 and everything that is needed, but when I run the following code I get an error. The code below is from: http://code.google.com/p/rdflib/wiki/IntroSparql. I have tried for hours to fix this but with no success. Can please someone help? import rdflib rdflib.plugin.register('sparql', rdflib.query.Processor, 'rdfextras.sparql.processor', 'Processor') rdflib.plugin.register('sparql', rdflib.query.Result, 'rdfextras.sparql.query', 'SPARQLQueryResult') from rdflib import ConjunctiveGraph g = ConjunctiveGraph() g.parse("http://bigasterisk.com/foaf.rdf") g.parse("http://www.w3.org/People/Berners-Lee/card.rdf") from rdflib import Namespace FOAF = Namespace("http://xmlns.com/foaf/0.1/") g.parse("http://danbri.livejournal.com/data/foaf") [g.add((s, FOAF['name'], n)) for s,_,n in g.triples((None, FOAF['member_name'], None))] for row in g.query( """SELECT ?aname ?bname WHERE { ?a foaf:knows ?b . ?a foaf:name ?aname . ?b foaf:name ?bname . }""", initNs=dict(foaf=Namespace("http://xmlns.com/foaf/0.1/"))): print "%s knows %s" % row The error I get is: Traceback (most recent call last): File "...", line 18 in <module> initNs=dict(foaf=Namespace("http://xmlns.com/foaf/0.1/"))): TypeError: query() got an unexpected keyword argument 'initNS'

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• How to access members of an rdf list with rdflib (or plain sparql)

  - by tjb

  What is the best way to access the members of an rdf list? I'm using rdflib (python) but an answer given in plain SPARQL is also ok (this type of answer can be used through rdfextras, a rdflib helper library). I'm trying to access the authors of a particular journal article in rdf produced by Zotero (some fields have been removed for brevity): <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:z="http://www.zotero.org/namespaces/export#" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:bib="http://purl.org/net/biblio#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:prism="http://prismstandard.org/namespaces/1.2/basic/" xmlns:link="http://purl.org/rss/1.0/modules/link/"> <bib:Article rdf:about="http://www.ncbi.nlm.nih.gov/pubmed/18273724"> <z:itemType>journalArticle</z:itemType> <dcterms:isPartOf rdf:resource="urn:issn:0954-6634"/> <bib:authors> <rdf:Seq> <rdf:li> <foaf:Person> <foaf:surname>Lee</foaf:surname> <foaf:givenname>Hyoun Seung</foaf:givenname> </foaf:Person> </rdf:li> <rdf:li> <foaf:Person> <foaf:surname>Lee</foaf:surname> <foaf:givenname>Jong Hee</foaf:givenname> </foaf:Person> </rdf:li> <rdf:li> <foaf:Person> <foaf:surname>Ahn</foaf:surname> <foaf:givenname>Gun Young</foaf:givenname> </foaf:Person> </rdf:li> <rdf:li> <foaf:Person> <foaf:surname>Lee</foaf:surname> <foaf:givenname>Dong Hun</foaf:givenname> </foaf:Person> </rdf:li> <rdf:li> <foaf:Person> <foaf:surname>Shin</foaf:surname> <foaf:givenname>Jung Won</foaf:givenname> </foaf:Person> </rdf:li> <rdf:li> <foaf:Person> <foaf:surname>Kim</foaf:surname> <foaf:givenname>Dong Hyun</foaf:givenname> </foaf:Person> </rdf:li> <rdf:li> <foaf:Person> <foaf:surname>Chung</foaf:surname> <foaf:givenname>Jin Ho</foaf:givenname> </foaf:Person> </rdf:li> </rdf:Seq> </bib:authors> <dc:title>Fractional photothermolysis for the treatment of acne scars: a report of 27 Korean patients</dc:title> <dcterms:abstract>OBJECTIVES: Atrophic post-acne scarring remains a therapeutically challe *CUT*, erythema and edema. CONCLUSIONS: The 1550-nm erbium-doped FP is associated with significant patient-reported improvement in the appearance of acne scars, with minimal downtime.</dcterms:abstract> <bib:pages>45-49</bib:pages> <dc:date>2008</dc:date> <z:shortTitle>Fractional photothermolysis for the treatment of acne scars</z:shortTitle> <dc:identifier> <dcterms:URI> <rdf:value>http://www.ncbi.nlm.nih.gov/pubmed/18273724</rdf:value> </dcterms:URI> </dc:identifier> <dcterms:dateSubmitted>2010-12-06 11:36:52</dcterms:dateSubmitted> <z:libraryCatalog>NCBI PubMed</z:libraryCatalog> <dc:description>PMID: 18273724</dc:description> </bib:Article> <bib:Journal rdf:about="urn:issn:0954-6634"> <dc:title>The Journal of Dermatological Treatment</dc:title> <prism:volume>19</prism:volume> <prism:number>1</prism:number> <dcterms:alternative>J Dermatolog Treat</dcterms:alternative> <dc:identifier>DOI 10.1080/09546630701691244</dc:identifier> <dc:identifier>ISSN 0954-6634</dc:identifier> </bib:Journal>

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• RDF-raptor-parser

  - by naveen

  Hi All, I am trying to parse the rdf file but I am getting error while executing following code in ubuntu RDF::Reader.open("http://datagraph.org/jhacker/foaf.rdf") do |reader| reader.each_statement do |statement| puts statement.inspect end end as LoadError: Could not open library 'libraptor': libraptor: cannot open shared object file: No such file or directory. Could not open library 'libraptor.so': libraptor.so: cannot open shared object file: No such file or directory I installed all the required gems: rdf rdf-raptor ffi rdf-json rdf-trix Please help me how to rectify this problem thanks in advance Naveenkumr.R

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• Versioned RDF store

  - by Mat

  Let me try rephrasing this: I am looking for a robust RDF store or library with the following features: Named graphs, or some other form of reification. Version tracking (probably at the named graph level). Privacy between groups of users, either at named graph or triple level. Human-readable data input and output, e.g. TriG parser and serialiser. I've played with Jena, Sesame, Boca, RDFLib, Redland and one or two others some time ago but each had its problems. Have any improved in the above areas recently? Can anything else do what I want, or is RDF not yet ready for prime-time? Reading around the subject a bit more, I've found that: Jena, nothing further Sesame, nothing further Boca does not appear to be maintained any more and seems only really designed for DB2. OpenAnzo, an open-source fork, appears more promising. RDFLib, nothing further Redland, nothing further Talis Platform appears to support changesets (wiki page and reference in Kniblet Tutorial Part 5) but it's a hosted-only service. Still may look into it though. SemVersion sounded promising, but appears to be stale.

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