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Questions tagged [linked-data]

Linked Data refers to a set of best practices for publishing data on the Web under the Semantic Web standards (RDF, SPARQL, etc.). Please consider asking your question on https://opendata.stackexchange.com, if your question is not closely related to programming or is related to a particular Linked Data dataset.

T. Berners-Lee outlines four principles of linked data in his "Linked Data" note:

  1. Use URIs as names for things
  2. Use HTTP URIs so that people can look up those names
  3. When someone looks up a URI, provide useful information, using the standards (RDF*, SPARQL)
  4. Include links to other URIs, so that they can discover more things
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YAGO TTL to Local Virtuoso Instance

I am trying to load the YAGO ontology to a local instance of Viruoso database. YAGO is available here in 7zip format. However, using the online gui I am unable to load the 7zip file. Using the terminal I am still unable to load the db. However, if I…
nikosdi
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SPARQL update in Sesame not working

I'm trying to add a triple to my Sesame repository using the SPARQL Update function. The statement is as below: PREFIX owl: PREFIX xsd: PREFIX rdfs:…
kurious
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How to install SILK workbench?

I want to install Silk - The Linked Data Integration Framework. I have downloaded latest version (2.6.1) of SILK WorkBench (https://github.com/silk-framework/silk/releases). I want to install it in both Mac and Windows Machine. Project README file…
Beautiful Mind
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SPARQL query not inferencing properties after class specified

I am running a test query on SPARQL to test inferencing. My query is as follows: PREFIX eem: PREFIX ns: PREFIX sc_data: PREFIX dbp:…
kurious
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apparently unnecessary SPARQL filter

Given the graph http://example.org/ as: @prefix foaf:. foaf:name "Alice". foaf:name "Bob". foaf:name "Carl". Why this SPARQL query works: PREFIX…
ffa
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Difference DBpedia ontology and DBpedia mapping

I'm trying to do some date mining with DBpedia. Now I have a dataset with properties of DBpedia ontology and DBpedia mapping and I'm not sure about the difference between those two. What is the difference between DBpedia ontology and DBpedia…
user1939400
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Sesame triplestore was working but it won't anymore after I modified the web.xml file

I had sesame triplestore installed on my computer and it was working fine. When I ran into trouble pertaining to CORS while using ajax for fetching data from the server, I tried modifying the web.xml file at C:\Program Files (x86)\Apache Software…
kurious
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Apache Marmotta - SPARQL query interface - Missing Squebi library

Those who have hands-on knowledge of Apache Marmotta use in Windows environment, please help me! I have installed marmotta on my Windows 8.1 env. Now as we know, marmotta supports a RDF framework (where sparql is used as the query language), and we…
Jayanta Mandal
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querying dbpedia rdf resolve predicate

I'm trying to query dbpedia about some country, and I successfully get all it's triples, including this one for example: "http://live.dbpedia.org/resource/Spain", "ns8:capital", "http://live.dbpedia.org/resource/Madrid" then I want to get data…
Herokiller
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How to set up a test environment for linked data

I'm wondering how to set up a stage/test environment for a linked-data infrastructure. Indeed, in my organization we have the prerequisite to always have test env together with a prod env. Until here nothing abnormal. However, this can be…
MaatDeamon
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How can I retrieve the statistics for any name or object by using sparql and dbpedia?

I want to retrieve the following statistics for any given thing: dbpedia-owl:wikiPageInLinkCountCleaned dbpedia-owl:wikiPageRank dbpedia-owl:wikiHITS dbpedia-owl:wikiPageOutLinkCountCleaned Method: What I am doing is very complicated. First:…
Hani Goc
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Given a predicate, count number of objects for each subject?

I'm trying to write a SPARQL query that will return a subject and the number of objects it has for a particular predicate. Here's what I have, but it is not working. SELECT ?quote (COUNT(?quotedBy) AS ?no) WHERE { ?quote…
Jeff
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Is GoodRelations yet actual or there are other newer alternatives?

I found GoodRelations and thinking about its implementation on some projects. But i have seen that the last update is on 2011. So, my question is: is GoodRelations yet actual or in the meantime are emerged other more valuable and used…
Aerendir
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RDF and Linked USDL (description of service)

I'm work in a project and I have to make a description of several services. I use Linked USDL and RDF. I want know if the description is correct in that way. Basically, I have services, properties and values of properties. Each file has the…
Gabriela Cavalcante
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Yago's "means" relatioin

I am new to SPARQL, OWL and the knowledge base Yago2s. I have been reading about entity linking which is basically a process of finding named entities in online textual documents and linking them to the entities in knowledge base like Yago2s. For…
AvinashK
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