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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
371 questions
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Reasoning doesn't give same results with *

I am enabling Forward chaining like this: static final String inputData = "http://cgi.di.uoa.gr/~pms509/past_projects/2014-2015/hw1/kallikratis.n3"; MemoryStore store = new MemoryStore(); Repository repo = new SailRepository(new…
gsamaras
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Counting numbers of DBpedia wikilink and external link using SPARQL

I am currently querying DBPedia for a list of person names by using the SPARQL package in R. And now I am working on counting of different categories for one person, such as the number of wikilink or external_link. But I only know to count all the…
Frown
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"if" in a SPARQL query

my problem is very simple: I have a source my:g1 that contains: my:a1 my:b "literal 1" Then I have a second source my:g2 that contains: my:a2 my:b my:c. my:c rdfs:label "literal 2" how can I set a SPARQL query that produces something like: | ?a …
ffa
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Multiple counts in Sparql query

I would like to create a Sparql query that contains two counts. The query should get the 'neighbours of neighbours' of A (A → B → C, where A is the start node), and should report for each C, how many paths there were from A to…
user1255553
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SPARQL query to extract schema.org/Product isSimilarTo property

I have written a query of the form below to extract data from a schema.org/Product, however there is a isSimilarTo property associated with schema.org/Product that could have multiple values, I need to extract all the values for isSimilarTo property…
user1965449
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What are the data differences between live.dbpedia.org, dbpedia.org, and the dbpedia data dump?

I understand that live.dbpedia.org is closer to a real time version of the dbpedia.org data, but that invites the question, how often is the regular dbpedia extraction/update process run? How often are the data dumps updated? Also, it's been said…
Kristian
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Yago ontology for entity disambiguation

I am using the propriety rdfs:type equal to dbpedia-owl:Organisation for selecting (obviously) organizations on my SPARQL query: SELECT ?s WHERE { ?s a dbpedia-owl:Organisation . } LIMIT 10 I would like to consider the YAGO ontology for…
Fernando Ferreira
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To use iSPARQL to compare values using similarity measures

I have a question for you. I would like to write a query that retrieves the values ​​that are similar (given a function of similarity, such as Lev) to a given string "Londn" to make the comparison with the predicate "RDFS:label" of DBPedia. In…
Musich87
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Querying the Linked Movie Database (LMDB) with SPARQL

Given an RDF graph like this: :Matrix [rdfs:label] :The Matrix . :Matrix [movie:id] :23 . :Matrix [movie:actor] :Keanu Reaves . :Matrix [movie:actor] :Laurence Fishburne . :Die Hard 3 [rdfs:label] :Die Hard 3 . :Die Hard 3 [movie:id] :42 . :Die Hard…
s1ck
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Different datasets in Yago?

I'm new on this, so sorry if I'm not clear. My question is, why does the information shown in Yago browser for Nagoya University of Arts differ from the one in here or making a SPARQL query on the Yago endpoint like SELECT * WHERE { …
yuka_mustang
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Open linked data_a data set

I downloaded a data set which is supposed to be in RDF format http://iw.rpi.edu/wiki/Dataset_1329, using Notepad++ I opened it but can't read it. Any suggestions?
Majed Sadi
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How do I define a custom @context for a verifiable credential?

Here is an example of a verifiable credential I want to create { "@context": ["https://www.w3.org/2018/credentials/v1"], "credentialSubject": { "id": "did:example:not-a-real-did", "competence": ["AM", "B"], "dateOfBirth":…
Frank Weslien
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URI to identify certificates

Are there some commonly used or standardized URI schemes or patterns that are used to identify SSL certificates, for example for description in linked data applications? The URI does not necessarily have to be resolvable, but it should be unique for…
IS4
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Wikidata Virtuoso SPARQL Endpoint - How to get more than 100,000 results

I need to get Wikidata artifacts (instance-types, redirects and disambiguations) for a project. As the original Wikidata endpoint has time constraints when it comes to querying, I have come across Virtuoso Wikidata endpoint. The problem I have is…
user15519921
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converting json to turtle

I am looking for tools to convert json to turtle format. For example: { "name": "Bart Simpson", "age": "11" } to something like: @base . @prefix rdf: . @prefix rdfs:…
FewKey
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