I've been reading about Semantic Web technologies such as RDF/RDFS and "ontology", but was wondering how each of these are related? At the moment the terms all seem interchangeable, or I'm not unde...

In RDF 1.1 XML Syntax documentation rdf:resource is used as a shortened form when defining Empty Property Elements: When a predicate arc in an RDF graph points to an object node which has no fur...

Do you know some paper or algorithm in NLP that is able to extract sentences from text that are related to given entity (term). I would like to process some reviews (mainly tech), but I found out t...

While I am trying to understand what semantic web is and what technologies are used, I saw from https://en.wikipedia.org/wiki/Semantic_Web#Semantic_Web_solutions The Semantic Web takes the solut...

I am trying to grasp the concept of Semantic Web. I am finding it hard to understand what exactly is the difference between RDF and OWL. Is OWL an extension of RDF or these two are totally di...

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

Currently i am trying to figure out, then to use OWL and then to use UML to describe a domain of interest in a Software Engineering process. I read this paper by Atkinson, which gives a very good...

This is a question I have been struggling with for a while. What is the proper way to mark up name/value pairs? I'm fond of the <dl> element, but it presents a problem: There is no way to se...

I'm doing a small exercise on sparql. Using Dbpedia Endpoint, I need to count number of triples. This is my query // Get the number of triples // SELECT (COUNT(*) as ?Triples) WHERE { ?s ?p ?...

I'm doing a lot of research right now on Semantic Web and complex data models that represent relationships between individuals and organizations. I knew a little semantic ontologies although I neve...

I am adding few new DataType in the OWL using Protege. The DataType is like percentage and I want to specify it's range with the double value ranging from 0 to 100. Similarly a DataType named Qua...

There's 2 Dublin Core vocabularies DC terms and DC elements. They define almost the same classes and properties. So what is the key differences between them, and when to use each one.

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....

My goal is to implement a semantic search for my data. My data domain contains proffession skills. I need additional relations for my data structure like 'sameAs' and 'broader'. So, for example if ...

I've been looking all around on why OWL Full is undecidable, but I haven't found an easy to understand example that would lead me to comprehend it. I've found statements that explain that it is du...

The question of large scale data architecture is of course a vast topic and I am far from an expert. However, I am interested in how JSON-LD is used at scale, so please excuse the lack of specifici...

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 Jav...

I need to know the difference between RDB2RDF tools. Could anybody tell me what are the pros and cons of RDB2RDF tools? Especially for the following ones: Virtuoso, Ultrawrap, Ontop, Morph, X...

I'd like to confirm something about the 303 redirect protocol implication. If one does follow the convention of building RDF (resources/instances file as opposed to vocabularies) using slash URI ...

What the asterisk mean in this SPARQL query? SELECT ?uri ?type WHERE{ ?uri a ?type. ?type rdfs:subClassOf* example:Device. } Does it mean "subclass of a subclass"? Can I use it with other pred...

I have problem with SPARQL. I want to select something from category. For example subjects. I make query like this in http://dbpedia.org/snorql. SELECT ?category ?subject WHERE { ?category a sko...

I'm building a small prototype of a Movies semantic search engine based on the data of LinkedIMDB I've defined some Query Types as an example of use cases search by entity name search by entit...

How adjective are treated in a semantic web RDF triples? For example, how to traslate in RDF triples the following statement ? Bob has a new car Maybe: subject: bob predicate: has object: ca...

Using OWL API 3.4.9. Given an OWLClass and on ontology, how can I get <rdfs:label> of that OWLClass in that ontology? I hope to get the label in the type of String.

Is it possible to bound the length of property path? For example getting all the triples with lengths that are between (m,n) or all that are not between this range? For instance, how could this be ...