Top "Ontology" questions

Ontology is a formal representation of knowledge as a set of concepts within a domain, and the relationships between those concepts.

Are there any tools to visualize a RDF graph? (please include a screenshot)

I'm looking for a tool that will render a RDF graph in a reasonably useful graphic format. The primary purpose …

rdf semantics semantic-web owl ontology
What is an Ontology (Database?)?

I was just reading this article and it mentions that some organization had an Ontology as(?) their database(?) layer, and …

database ontology
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 "…

rdf sparql semantic-web ontology protege
How to create an ontology in python?

Are there libraries or certain "techniques" that you can use to create an ontology of elements? Or "design patterns"? I …

python text computer-science ontology
The best tool for visualizing ontologies?

I am looking to visualize ontologies for understanding and making others understand. I would prefer to have top-down hierarchy of …

visualization semantics rdf ontology protege
how can I recognize object properties vs datatype properties?

My ontology is book classification library. I have problems in this. I want to build a book classification ontology by …

ontology owl protege
What is the difference between DatatypeProperty, ObjectProperty, & FunctionalProperty, and when should I use them?

When writing an ontology, there are several very commonly used types, including: DatatypeProperty ObjectProperty FunctionalProperty InverseFunctionalProperty The first three kinda …

rdf sparql owl ontology foaf
How to query Classes with Object Property in Sparql

Does any one know how to query Classes with Object Property in Sparql? Assume we have an OWL file which …

rdf sparql ontology owl rdfs
How to create an ontology in Java?

I've some data triplets that I want to write in some sort of basic OWL ontology. I've triplets like: Delhi …

java jena ontology
SPARQL query to retrieve all objects and properties

Using the Wine ontology, I want to create SPARQL query so I can retrieve all wines and their properties like …

sparql ontology sesame