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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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List of preferred namespace prefixes?

Are there any lists of preferred namespace abbreviations used in XML and Linked Data? vann:preferredNamespacePrefix describes preferred namespace prefix to use when using terms from this vocabulary in an XML document, but I have a hard time…
miku
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How to query linked data with SPARQL

Is it possible to query linked data with SPARQL? For example, I have a RDF file (lets say this one) and a SPARQL query like this one: PREFIX rdf: PREFIX dc: PREFIX cc:…
Slevin
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How I can retrieve a DBPedia page that start with "http://fr.dbpedia.org"

I have a DBPedia resource as http://dbpedia.org/page/London . I would like to get French page of http://dbpedia.org/page/London using SPARQL. I have noticed that I can retrieve this information through owl:sameAs. I am trying to write this query…
Musich87
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Converting an RDB to RDF with autogenerated code

I am using the OpenLink Virtuoso software to convert a Relational Database to RDF using this tutorial: Automated Generation of Linked Data Views over Relational Data Sources with Virtuoso I have a database with 5 tables (Authors, Keywords,…
sokras
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Are dcterms:references and dc:relation are mutually exclusive

I'm trying to create a schema for an XML document interchange I'm creating, and there are three variations of reference want to indicate Citation (one article cites another) Derivation (research furthering previous experiments) Dependency (reports…
CodeGorilla
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Linked Data (RDF) Content Negotiation with apache

I was wondering if someone could provide me with the typical rule, to serve the appropriate file when a resource is requested, with respect to the content type required. To be more specific here is my situation: I have a purl URL that i redirect to…
MaatDeamon
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RDF 303 redirect clarification

I'd like to confirm something about the 303 redirect protocol implication. If one does follow the convention of building RDF (resources/instances file as opposed to vocabularies) using slash URI instead of hash URI for flexibility purpose, does it…
MaatDeamon
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Property like rdfs:range but suggestive and not exclusive

I'm authoring a vocab currently and would like to suggest a range for a property to give users as hint what resources they could use. I currently specify an rdfs:range for the property but this is too restrictive.
vanthome
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Finding common categories or supercategories of resources

I'm wondering if we can know whether two resources have the same category or some subcategory (i.e., belong to categories of some common supercategory) in DBpedia? I tried this query in the DBpedia endpoint but it's wrong: select distinct ?s ?s2…
BigNoob
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RDFLib: get all URIs under a namespace

How to get the list of URIs under a Namespace in RDFlib? For example, we can do: from rdflib.namespace import FOAF But how do we find out what URIs are available in FOAF? In fact, there are several namespaces (RDF, RDFS, FOAF, ...), and I find it…
freesoil
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Web Crawler for Linked Data in Java with Jena Library

I have to implement a Web Cralwer that visits the Linked Data on the Web. I have built a simple functionality for that. I have three queries for that: What are the seed URIs I should use. The web sites which provide data in RDF format and follow…
Prannoy Mittal
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Is there a way to prevent WebVOWL creating undefined union classes?

I'm working on a digital humanities project where I'm trying to use WebVowl to visualise an ontology I made in Protégé. When I import the ontology into WebVowl it generates a lot of undefined union classes that make it impossible to export as TTL.…
HEWalker
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What's the principle of SPARQL `SERVICE` clause query?

I know that SPARQL federated query engine (such as Jena) decomposes it into individual SPARQL based on Service, then sends it to the specified SPARQL endpoint for execution, and finally combines the query results. I know the usage of the SERVICE…
chenkun
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DBPedia Query not returning All I need

I want to retrieve from DBpedia all the states and territories in India as well as all the cities contained in them. I have a long query that does a UNION and returns the territories but not any states or cities. For brevity, I'm just including the…
Michael DeBellis
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Are there some Linked data websites use distributed sparql Endpoints and provide cross-domain data search services?

Is there a website x: Searching rdf resources from distributed sparql Endpoints. Rdf resources come from multiple subject areas and are related . Provide some semantic services such as QA, route search ... I found that: 'https://lod-cloud.net/'…
chenkun
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