Table of Contents
What are axioms in ontology?
Axioms. assertions (including rules) in a logical form that together comprise the overall theory that the ontology describes in its domain of application. This definition differs from that of “axioms” in generative grammar and formal logic.
What is DL in Semantic Web?
DL-Learner – Structured Machine Learning on Semantic Web Data.
What is axiom in protege?
Axiom annotations button Visible in all Protege lists (such as the class description view). This pops up a dialog that allows annotations to be added to the row that was selected. When annotations exist on a particular axiom (row) the button is modified so that it is easy to scan.
Where are ontologies stored?
There are several options for storing ontologies in disk files, e.g. Triple stores and hierarchical stores. Triple based stores use N-Triple files to store and manage ontological data, e.g. AllegroGraph and OWLIM, etc. Hierarchy stores use XML files to store ontological data, e.g. HStar, Maria’s tool, etc.
What is difference between RDF and owl?
RDF is also a vocabulary that along with the RDFS vocabulary provides a set of terms that can be used for creating general/abstract descriptions of resources. OWL is a vocabulary built with RDF and RDFS vocabularies that provide new terms for creating more detailed descriptions of resources.
What is a class axiom?
Class Axioms are used to define classes, e.g. an defines the existence of a class and is a class axiom, likewise is the ID of the class a class axiom. The set of individuals linked to the class is called class extension.
What are the components within an owl ontology?
An OWL ontology consists of Individuals, Properties, and Classes, which roughly correspond to Protégé Instances, Slots and Classes. Individuals, represent objects in the domain that we are interested in5. An important difference between Protégé and OWL is that OWL does not use the Unique Name Assumption (UNA).
Why do we need ontologies?
So why do we need ontologies, and what is their significance? Ontologies enable the sharing of information between disparate systems within the same domain. There are numerous freely available ontologies from various industries. Ontologies are a way of standardizing the vocabulary across a domain.
What syntax can be used for OWL ontology?
For description of OWL ontology or knowledge base, the DL syntax can be used. There is an “abstract” LISP-like syntax defined that is easier to write in ASCII character set (see also the first and the second table below). Since OWL is syntactically embedded into RDF, all of the RDF serializations can be used.
What is in the OWL DL?
The OWL DL descriptions, data ranges, properties, individuals and data values syntax and semantics are summarized in the first table below, OWL DL axioms and facts are summarized in the second table below.
Is there a Lisp-like syntax for writing in owl?
There is an “abstract” LISP-like syntax defined that is easier to write in ASCII character set (see also the first and the second table below). Since OWL is syntactically embedded into RDF, all of the RDF serializations can be used.
Which RDF serializations can be used with Owl?
Since OWL is syntactically embedded into RDF, all of the RDF serializations can be used. RDF/XML is the normative syntax and should be used to exchange information between systems.