triplestore

I've written the following query: SELECT DISTINCT ?predicate ?object ?label WHERE { VALUES ?subject { <http://dbpedia.org/resource/Hercules_(1997_film)> } ?subject ?predicate ?object . ?predicate rdfs:label ?label . FILTER(langMatches(lang(?object), "EN")) } LIMIT 100 When I write the FILTER line this way, I've essentially filtered out all non-literals ( side question: are literals the only type that can have a language tag? ) So, how do I keep all of my results and filter out non-english literals only? You could use the isLiteral function to apply the language restriction only to objects that

I'm new with triple stores and I need a good recommendation for an open source triple store, where I can store OWL files. Does someone have some recommendations for me? Thank you a lot! Bests M Rock I think 4Store would be a good choice, which is fast and stable. You can get some information from project repository Jena TDB and Sesame RDF4J would be another choice. Both are open source. You can refer the comparison between Jena and Sesame here Other materials: More large triple stores introduction . RDF Store Benchmarking Jeen Broekstra As OWL files are RDF, any RDF triplestore will do for

I've been reading about semantic web technologies such as RDF and OWL, and am intrigued about the possibilities of building an RDF / triple-store semantic database on top of my existing relational DBs. It's simply an R&D exercise, to see what I can do. I like the look of OWLIM , but some basics are failing me. How exactly is one meant to build and then use an OWL ontology? Do you build it with something like Protege , then import it into your repository? Or is the ontology a byproduct of the software you develop to communicate with the repo? It's a newbie question, but I'm just not sure where

I'm currently planning a big project containing big data. I already used the search and all results tell me that it's not possible to import Freebase into any triplestore without usage of 3rd Party Tools like BaseKB or Freebase to RDF As I can see, the dump is already available as RDF, so where is the problem if I want to import the dump into my 4store triplestore and access the data via SPARQL? For everybody having Problems importing the Freebase Dump: 1) Keep your RDF/Turtle Parser updated. (Latest Version of raptor 2 can recognize the '.', e.g. at ns:common.topic.notable_for.example 2) The

I need to store RDF triples, while keeping track of modifications. Is there anything out there for this service? Alternatively, how would you keep track of revision while using a context-aware triplestore ? Edit : please note that I don't need only the changeset. I also need to see the triples at any time in the past. I tried to address this sort of thing by storing additional triples describing who said what, when. But you need reification, named graphs, or quads which can ruin decidability. in addition to the other answers, also take a look at the Lensfield system (research software at the

I admit that this is basically a duplicate question of Use freebase data on local server? but I need more detailed answers than have already been given there I've fallen absolutely in love with Freebase. What I want now is to essentially create a very simple Freebase clone for storing content that may not belong on Freebase itself but can be described using the Freebase schema. Essentially what I want is a simple and elegant way to store data like Freebase itself does and be able to easily use that data in a Python (CherryPy) web application. Chapter 2 of the MQL reference guide states: The