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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SPARQL: using function bif:st_distance and bif:st_points do not work outside SERVICE

I'm trying to write a SPARQL request, where I want to query country names from my own dataset, use the dbpedia resource to retrieve the countrie's latitude and longitude and then calculate the distance among them with the bif:st_distance function.…
coolaturon
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How does a SPARQL type expression work internally (e.g. ?a rdf:type ?b)?

PREFIX rdf: PREFIX owl: PREFIX xsd: PREFIX rdfs: PREFIX my: SELECT…
Ionized
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SPARQL - Get entity type from a String

I'm using Wikidata with the purpose to find, for the String "Scotland", the values of the properties "type / instance of", "subclass of" and "part of" if they exist. For example, manually by browsing the Wikidata's website, I type Scotland, I find…
Olscream
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How to do sparql query to get provenance data in DBpedia?

I want to get provenance data in DBpedia and here's the sample query: PREFIX rdfs: PREFIX dbo: SELECT DISTINCT ?novel WHERE { ?novel rdf:type dbo:Novel } LIMIT 1000 OFFSET…
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OWL Class Expression Syntax Minimum and Maximum Cardinality for Object Properties

I am currently trying to model an ontology in Protégé. In the documentation I can find all kind of class expressions but is there a way of defining a minimum cardinality AND a maximum cardinality at the same time? If this is not possible, could you…
Janothan
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What are the movies that Rocky owns, as inferred by the semantic web owl model?

I'm trying to understand the semantic web, and know a little about rdf, rdfs, and owl. Correct me if I'm wrong, but the following image is an owl diagram that shows the relationship between some properties, classes and objects. I'm having a little…
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Dbpedia Dump has missing Values?

I just downloaded some dumpfiles in .ttl format from http://wiki.dbpedia.org/downloads-2016-10. Here an Overview of the files I got in my triplestore: E:/virtuoso-opensource/vad/instance_types_de.ttl instanceTypesDe …
pyysaw
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How do I interact with Apache Jena locally? - MacOS

I may just be going at this wrong, but I am not sure how to interact with Apache Jena on my computer. I think my main question revolves around where I store files and how I run them. I use Atom editor and work in Python and Javascript normally. My…
detachedhead
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Offline use of semantic web vocabularies

There are some useful vocabularies out there for use of semantic web applications, one of which is the well known "foaf". How should I use it in an offline system, meaning a network disconnected from the www? Is it downloadable? Should I use some…
DannyL
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SPARQL - Inverse Path of dynamic discovered relationship

I have a Graph Database that implements only one side of relationships in the model structures. For instance, All Broader relationships are mapped as skos:broader. All Narrower relationships are mapped as ^skos:broader (for whatever reasons they…
Busturdust
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Have I interpretted this "semantic web primer for object oriented developers" correctly?

This document states that "Therefore, pointing ack(sic) to the above example, if something has a price, then it can be handled as an instance of Product, even if it partakes in other declarations (or triples) " Do a word search to find the…
Chechy Levas
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Hermit and OWLApi for retrieve object property assertions

I'm try to retrieve property assertions from reasoner (hermit 1.3.8.4) and OWLApi (3.4.10). In this picture, I want to retrieve "isGrandfather Sandro, isGrandfather Sergio". Picture - object property assertions I try to use Ignazio answer in:…
erfelipe
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java.lang.ClassNotFoundException: org.apache.jena.ontology.OntModelSpec

I'm having trouble with my semantic web application coding. The error says java.lang.ClassNotFoundException: org.apache.jena.ontology.OntModelSpec. I'm using Eclipse JEE Luna, Apache Tomcat 7, JDK 7u79, and Apache Jena 3.6.0. The class should be…
Nanu
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Is SPARQL a reasoner?

I'm writing my master thesis about linked data in archives and I was wondering if you could help me with a question. I've read this book about LD and came along this sentence: SPARQL is the query language of RDF triple stores, but the query …
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using pellet OWL reasoner on a cluster

I recently gained access to computing cluster (using a Linux OS). Has anyone had any experience running pellet (https://github.com/stardog-union/pellet) on a cluster? I have some large ABox datasets I would like to run using pellet.
Bill
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