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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What does "reify" and "reification" mean in relation to RDF?

I do think I understand the meaning of these words in programming languages, but it is not clear in regards to RDF and triples. Is there an example that will help me to understand? Thank you
Eli Schneider
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What use cases for OWL?

I've read about OWL - Web Ontology Language (few pages only), but what are some real-world use cases/implementations for it?
Aravind Yarram
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In Semantic Web, are OWL EL, RL, QL all instances of DL? What is the difference? More inside

I'm using the pellet reasoner on a number of ontologies and have run the info method on a list of IRIs (in this case URLs). The two metrics that interest me are the DL Expressivity and OWL Profile. The OWL Profiles I'm getting range from "OWL 2,"…
Aeschylus
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Which Triplestore for rapid semantic web development?

Ease of installation/use is the most important factor here - not performance. Small is OK as large datasets are not expected.
Stephen
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Apache Jena vs Apache Marmotta

What's the difference between Apache Jena and Apache Marmotta? According to my readings both can be used for semantic web purposes. Both supports RDF,Triple store and so on. Both are based on Java. I hope this question will be valuable for those…
Techie
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Using itemprop="branchOf" from schema.org Microdata to refer to LocalBusiness's parent company

I'm creating a simple (well, it was going to be simple before I decided to mark it up with Microdata) web page containing company contact information for a business with two offices. I'm using schema.org and LocalBusiness for the two offices. Here…
David Oliver
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How to query RDF/OWL using SWI-Prolog's Semantic Web Library?

How can I use the SWI-Prolog Semantic Web Library to make a query into the OWL/RDF file and extract some information? The OWL/RDF file is having information about all the Debian packages so I need to make the query in order to find package…
codious
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Which semantic HTML tag for displaying side notes and admonitions?

I am writing an online tutorial with sort of side notes or as they call it "admonitions" similar to those in Django tutorial: https://docs.djangoproject.com/en/dev/intro/tutorial01/ (I mean the the boxes with green a frame and a note icon). Which…
jan
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Using the 'GRAPH' keyword in SPARQL to fetch remote graphs

I'm looking to use SPARQL for a relatively basic task: Given a FOAF graph, I'd like to parse the elements I find in there, get their tags (if they exist) and then, use those as new graphs from which to find information about those people. So for…
Geoffroy
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Is there an RDF ontology for blogs?

I'm setting up a blog, and I'm fascinated by RDF and the idea of the sematic web. I'd like to use RDFa to embed sematic data into my blog. There are several well know semantic web ontologies like FOAF for decribing people, ical for events, geo for…
Amandasaurus
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What's the difference between skos:ConceptScheme and skos:Collection?

From the W3C pages on SKOS collections I understand that concepts can be grouped in 'collections'. However, concepts can also be part of a concept scheme. Am I right in assuming that the difference between the two is that a conceptScheme will more…
Richard
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SPARQL Querying multiple ORs in the same filter

Ok lets assume I have 5 datatype properties with integers as values. These properties are asserted to individuals belonging to class "WWS". This class has like 4 individuals. But only some of the datatype properties exist in these individuals. How…
user3211165
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Using Jena to create a SPARQL query on DBpedia

Im trying to create a SPARQL query using Jena to query DBpedia. The query is working when I use it with standalone tools (Twinkle) but when I plug it in this Java code it returns an empty set. String sparqlQueryString1 = "PREFIX dbont:…
Marcom
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How to use alternative/new ontologies on an existing data set

Often when discussing the power of semantic databases and ontologies, I hear people say that RDF data is versatile because ontologies can be applied to the data to look at it in different ways. However, in my experience, a dataset is usually tied to…
Kristian
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How to concatenate a list of values in sparql?

Suppose I have a uri http://dbpedia.org/page/Manmohan_Singh now he has a list of years in his tag dbpprop:years. When I write a query like PREFIX rdf: PREFIX rdfs:…
RamPrasadBismil
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