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 mean by semantic?

I am searching the term 'Semantic Query Optimization'. But can't find any specific answer. Can you tell me what actually Semantic means?
Abhijit Mondal Abhi
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RDF semantic network for social robotics

I want to save the incoming visual data of a social robot into a semantic memory as RDF triple in the form "Subject, predicate, object". Im unsure how exactly this kind of datastructure should be programmed in C++. My first attempt was something…
Manuel Rodriguez
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Problems querying OWL ontology through OWL API

I have the ontology used in the OWL API examples. private static final String KOALA = "\n" + "
vincentdj
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JENA SPARQL WARN [main] (Log.java:80) - Binding.add: null value - ignored error in eclipse

I'm trying to run SPARQL queries on my self-made ontology in protege, I have stored the data in TDB persistent storage and so far I assume that data is being successfully stored in it. I have run several SPARQL queries of the same ontology file in…
Shahrukh Nasir
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Protégé import from http://w3id.org/XXX

I am having problems importing two ontologies in Protégé. These ontologies are stored in the following links Onto1 and Onto2 and are also in the W3ID.ORG URL re-direction service (Onto1Redirection and Onto2Redirection). I tried to import both of…
User 23
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How to Select resources with specific property in dbpedia with Sparql Query?

I have the query -- PREFIX rdf: PREFIX dbo: PREFIX rdfs: #select count(DISTINCT ?instance) # The number of suitable…
user6887048
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Classes and subclasses in OWL for SPARQL queries with inference

I have a question with OWL and SPARQL that I can't resolve. I have defined several classes, but for the question in question only 3 are the important ones: People, Men and Women; and its definitions would be the following: <#People> a owl:Class ; …
germaaan
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Predicates equivalent

I am looking for an approach to find two predicates (properties) of semantic web are equivalents or not? is that possible using description logic or another methods? Thanks a lot
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How to do select all on all instances of a RDF class?

I'm trying to do a select all query on my friend's dataset. I have some concern about the design of his RDF dataset, as the URI for every client is different. In that case, how is a select all query possible? This is my first time working with…
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Querying DBPedia using SPARQL to find subjects with same objects

I am trying to find all those resources from dbpedia for eg rdf:type person who have same object eg date of birth.? I thought of doing it with subquery but its definitely not the solution. Can anyone provide some useful pointer?
user765160
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Sparql - Traverse to top (broadest)

I have an internal triples dataset. I am trying to implement a typeahead feature for an application using the dataset. I am trying to figure out how I can conditional traverse to the Top Concept In this picture, if I searched for dreamworks, It…
Busturdust
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Sparql - Conditional Output

I am very new to the semantic web and sparql. I have an internal ontology that uses SmartLogic in order to manage the data. I am writing some simple queries to get started. PREFIX skos: # Simple Knowledge…
Busturdust
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Why do we put exifData property in metadata?

Can somebody help to understand why do we put exidData` as an attribute for metadata, since I don't really see the point?
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Same SPARQL query gives different results

The query in question is PREFIX dbo: select distinct ?label ?abstract where { ?concept rdfs:label ?label . ?concept dbo:abstract ?abstract . ?abstract bif:contains '"self driving cars"'…
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Oracle Semantic Web-SEM_RELATED operator does not produce desired results

I am trying the same scenario which Oracle Semantics Web documentation has listed for querying Cancer Ontology. Below are the steps which I have followed. 1). Created a tablespace. CREATE TABLESPACE rdf_tblspace DATAFILE…