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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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Wikidata SPARL query by generic property return object instead of statement

I want to disseminate the query by spreading the nodes like in the below query. SELECT ?item ?itemLabel ?prop ?object ?objectLabel ?prop2 ?object2 WHERE { VALUES (?item) { (wd:Q12418)} ?item ?prop ?object. ?object ?prop2 ?object2 SERVICE…
cuneyttyler
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Using shacl to validate a property that has at most one value in its properties

I'm trying to create a shacl based on the ontology that my organization is developing (in dutch): https://wegenenverkeer.data.vlaanderen.be/ The objects described have attributes (properties), that have a specified datatype. The datatype can a…
David Vlaminck
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How does SPARQL queries automatically read namespaces for abbreviations in virtuoso?

I've set up some namespaces in virtuoso, but when I used jena to do sparql queries in virtuoso, some namespaces were not abbreviated: @prefix sio: http://semanticscience.org/resource/SIO_ . @prefix cheminf: …
chenkun
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The process of creating knowledge graphs

So I am new to the world of the semantic web, RDF's and Ontologies How does the process of creating knowledge graphs work? Say I want to create knowledge graphs about a specific team and link everything about it the players, trophies and everything…
Nisi Zenuni
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Whether cross-domain URIs are supported by rdflib.js?

Whether cross-domain URIs are supported by rdflib.js? The following URIs are not parsed by…
chenkun
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How do linked open data datasets linked together?

I'm learning about RDF databases and the concept of "Linked Open Data (LOD)". According to what Wiki saids about LOD, many open-accessible datasets are published online and some of the resources in these datasets are interlinked with each other…
Trams
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How to query the path between two IRI within the same sparql endpoint

How to query the path between two IRI within the same sparql endpoint,Can I control the length and direction of the path.For example, I have some triples,input IRI_A and IRI_B,Can all the paths between IRI_A and IRI_B be detected? now i know that…
gaos
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How to discover the paths of two nodes in an endpoint or different endpoints

How to discover the paths of two nodes in an endpoint, preferably the paths of different endpoints. Can sparql be implemented , or is there any other way to do it
gaos
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why do I get 403 error with GraphDB when I use a different PC?

I was following this package tutorial for connecting to GraphDB. It worked. But then, I am now running the same code on a different PC and I get 403 Error... I don't understand why it used to work on one pc and now not on the other one? In the end,…
Arbo94
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How can I only download the individuals that I have created in Protégé?

I like to download the individuals that I have created in Protégé and upload them in GraphDB as a file. When I downloaded the whole ontology, I saw that the individuals were also downloaded in the XML/RDF file. But is there a way to only download…
Arbo94
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How to show "2022-09-12T00:00:01"^^xsd:dateTime only as 2022-09-12 or at least without ^^xsd:dateTime in my SPARQL results?

How to show "2022-09-12T00:00:01"^^xsd:dateTime only as 2022-09-12 or at least without ^^xsd:dateTime in my SPARQL results?
Arbo94
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Sequence with conditional nodes in OWL

I want to represent a sequence of action in OWL using protege. What I want to be able to represent is statement like : "if this action is true, then the next action is X. If it's false, then the next action is Y". Also I can have several condition…
Shamhus
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Adding and storing json-ld to an existing website / database

I've seen that there is a vote for a close request because the question is too broad. Let me rewrite the question: There is a need to add metadata to different database tables (and thus records) which exposes itself as linked data in the form of…
juFo
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Cannot create blank nodes from D2RQ mapping

I have one table (FCT_POPULATION) with the following structure, representing a quantity of a range over the years for a single city. So, in the same year, I have two quantities, varying according to a range (ids 1 or 2): CITY_ID | YEAR | RANGE_ID |…
Bruno
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Sequence in OWL using protege

I'm trying to define a sequence of action in OWL using protege. I have read the following topics: Modelling sequence order in OWL-DL ontology Assigning sequence in OWL using Protege The problem I have is that an individual can be in different…
Shamhus
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