Questions tagged [semantic-web]

Representation of database record subjects (a/k/a keys, IDs, entities), predicates (a/k/a columns, attributes), and objects (a/k/a values) as triples, where the first two are always URIs, and the third is either a URI or a literal; enabling humans and machines to more easily share, merge, and evaluate data from heterogeneous origins.

The Semantic Web (Web 3.0) provides a common framework that allows data to be shared and reused across application, enterprise, and community boundaries. It is a collaborative effort led by the W3C with participation from a large number of researchers and industrial partners. It is based on the Resource Description Framework (RDF).

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Simple reasoning operator Apache Flink

I am trying to implement simple reasoning operator using Apache Flink on scala. Now I can read data as a stream from a .csv file. But I cannot cope with RDF and OWL data processing. Here is my code to load data from .csv: val csvTableSource =…
xijox
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wikidata query how to filter the type of information founds

I want to find all the informations about Roger Federer(Q1426): SELECT DISTINCT ?entity ?entityLabel WHERE { wd:Q1426 ?p ?entity. SERVICE wikibase:label { bd:serviceParam wikibase:language" [AUTO_LANGUAGE],fr".} } What I want is: wd:Q233306…
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GraphDB reasoning makes different inference for Classes

I loaded the following statements in a repo with a ruleset OWL-Horst (Optimized). @prefix : . :Foo rdf:type owl:Class . :Bar rdf:type owl:Class . :Baz rdf:type owl:Class ; rdfs:subClassOf :Bar . If I look at the…
floatingpurr
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Makes using a URI as predicate them to a property?

I have only the following Turtle statement: x isAuthorOf y If I have only this statement where isAuthorOf is used as a predicate, means this that I can conclude that isAuthorOf is also a Property without instanciation (isAuthorOf rdf:type…
user3352632
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SPARQL: DISTINCT keyword is not working with VALUES

I have a SPARQL query as follows SELECT DISTINCT ?class FROM WHERE { VALUES ?k {
thisisshantzz
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Is a Property inverse function if the set of objects in this relation uniquely identifies the subject in OWL?

I have two individuals: x and y. They are in the following relationships: x hasProp a. x hasProp b. y hasProp a. y hasProp c. In general, the set of objects in the realtion of hasProp identifies the individual (here: x or y). In this case, can I…
user3352632
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How to use Jena's Union model with inference rules

I'm trying to keep a big model with reference data and in memory and attach other models with inference rules, and I need matching rules to fire when new triples are coming, lookup the reference data and all the new triples to end up in the second…
Utgarda
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How to express that instances with equal values of different classes are instances from an other class?

I have four classes: A, B, C and S. Class A has inferred instances i1 and i2 which are based on a numerial value condition (in Equivalent To). Class B has inferred instances i3 and i4 which are based on a numerial value condition (in Equivalent To).…
user3352632
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How to show data from the RDF archive in scala flink

I am looking for an approach to load and print data from .n3 files of .tar.gz archive in scala. Or should I extract it? If you want to download the file, it is located on http://wiki.knoesis.org/index.php/LinkedSensorData Could anyone describe how…
renataleb
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How to use double values in Protégé / OWL / DL for class expressions (Syntax)?

I want to use double values for class expression syntax in Protégé but I can't find any examples. All are using integer values, not double. For instance: http://protegeproject.github.io/protege/class-expression-syntax/ For instance, I want to…
user3352632
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Use the graphdb SPARQL browser with any endpoint

Maybe graphdb people won't like this, but I'd like to try their very nice browser with a couple of existing SPARQL endpoints, based on Virtuoso, Fuseki, who-knows-what (in the sense that they're not under my control, e.g. DBPedia). I wonder if their…
zakmck
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How to load ontology from multiple files through OWL API?

For a specific task, I want to load an ontology from several different files. In another words, I want to include all axioms from different files into an integrated ontology. And since those files can be in different format, for example, some of…
Yu Gu
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sparql - how to query through multiple entities?

I have a rdf-schema and the triples in the turtle syntax (extract): @prefix dbr: . @prefix xsd: . @prefix rdfs: . @prefix rdf:…
Fehler40
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How to use FOAF as part of another ontology?

I want to have a class Professor which will have some properties: name, surname and nationality. Now I just created a class Professor, a class Person and a class Nationality, and some data properties for name and surname and an object property…
moondaisy
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How to connect with Ontology?

I'm working on a semantic news website. I have a news data and I want to link it with any news ontology like BBC news ontology or "Rnews" ontology. Is there is a way to make this?
SHOSHA K
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