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Questions tagged [ontology]

Ontology is a formal representation of knowledge as a set of concepts within a domain, and the relationships between those concepts. Those concepts and relationships create graph-structures and can be described by the lattice theory or other mathematical models.

The ontology describes a domain of knowledge by concepts. All the relationships among concepts are represented in the ontology like concepts too. In general, we talk about the Cartesian multiplication of sets where our concepts can be like objects and subjects. As result, we can represent knowledge on the ontology by 5 level of definitions, namely: abstract, semantic, structural, conceptual and data levels.

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tool to view XML as a tree?

Is there any java based tool to view the XML file in the form of binary/ternary tree? I need a pictorial view of tree.. in the form of nodes and edges.. like a graph.. please help me
karthi
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Does an ontology has any impact on the Marklogic triple index?

In Marklogic 9, with a very large set of triples loaded, some SPARQL queries were very slow even if the triple index option was enabled. At that time, billions of data triples were loaded but no ontology triples at all were. After the load of the…
user10984902
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Java code implement OWLAnnotationPropertyAssertionAxiom

I want to add annotation assertion on a triple. I tried doing the same using Protege and was able to achieve it. The RDF/XMl generated from the Protege looks like this:
smrati hans
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SPARQL query using dotNetRDF returns the correct amount of results but with empty values, why?

I have tested my SPARQL query on the pizza ontology in protege and the query works fine. Problem is when I attempt to run the same query on the same ontology file using dotNetRDF. The query returns the correct amount of results, but they all seem to…
NIM4
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steps or code for ontology visualization to get clear numbers by class on a tree or a bar chart

I am looking for steps or code for ontology visualization to get clear numbers for individuals by each class on a tree or a bar chart. I can convert the ontology file into another format such as xml. Just need help for how to do, many thanks! It can…
Joanne
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Is UML class diagram operation not important in ontology?

I am developing an algorithm converting UML class diagram into OWL ontology. Based on may reviews, I am unable to find any works that emphasizing on one element of class diagram which is operation. Is operation not really important or can be…
MuhammadMahmud
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Creating simple ontologies/ hierarchies with Google Protocol Buffer format

I want to know if it is possible to represent a hierarchy of concepts like very simple ontologies in Google Protocol Buffer format? if yes, can someone give me an example?
Hossein
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Do any branches of graph theory consider abstraction?

By abstraction I mean treating a complex structure as a simpler structure: in this case, treating a graph as a node. Do any branches of graph theory (or web ontology engineering) include a construct which can incorporate a graph into another graph…
Louise
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List Class with Apache Jena in big OWL files

I'm try to just list class from OBI Ontology (http://obi-ontology.org), but Jena (3.9.0) is not working in this big (not so big) OWL file. The code is: public void Jena() throws FileNotFoundException { OntModel model =…
erfelipe
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How to create semantic-web URIs for entities from different databases

I'm using Karma to map the tables of my databases to a well known ontology (the MusicOntology). Some tables refer to other through the id. I'm not sure about the way I should create URIs: Using the id would lead to a situation where same entities…
Luca Di Liello
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SPARQL: ignore datatype of a value in a query

I have an ontology entity instance in RDF/XML like this:
nvbach91
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Connection of transitive and symmetric object properties in OWL possible?

I am working with an ontology (OWL, Protege 4). I have 3 individuals: A, B and C. And two object properties: bears and hasContactWith. The relationships should be next: A bears B; B bears C; A hasContactWith B; B hasContactWith C. The property…
Taras
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Class as unionOf but without this other classes being disjoint

I have a class A with two subclasses B and C, and I want to say that A is the union of B and C. But B and C are not disjoint, so I can't use Disjoint Union Of in Protege. What is the correct way of doing this? And Equivalent To with and and?
moondaisy
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How to specify "any" value of a property?

I assigned a restriction "hasOpeningTime" to a class "CategoryHierarchy". It means that all individuals of the class "CategoryHierarchy" must have the property "hasOpeningTime" specified. There is the following relation: CategoryHierarchy ->…
ScalaBoy
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Cannot retrieve an instance from the ontology

I inserted a new user profile's instance into my ontology. However, I cannot properly retrieve it with SPARQL SELECT query. This query returns nothing. PREFIX rdf: PREFIX owl:…
ScalaBoy
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