#Owl 2 owl text messaging program full#
#Owl 2 owl text messaging program software#
#Owl 2 owl text messaging program code#

In a more elaborate example, in the following image, a new transitive property isPartOf is defined, In a simple example, we can define that the property hasSpouse is symmetric, functional and irreflexive: We can define many things about properties (seeДЄnd OWL2 Direct Semantic - Object Property Expression Axioms for details), that a property is transitive, symmetric, asymmetric, reflexive, irreflexive,ДЇunctional (can have only one value), inverse-functional (its inverse is functional), inverse to some other property, subproperty of some other property, equivalent to some other property, or disjoint with some other property (two individuals cannot be linked by both properties in the same time). The images generated by Protege then show the label instead of the name.ДЄnnotationAssertion( rdfs:label :MU 'Masaryk University' )ДЄnnotationAssertion( rdfs:label :ICS 'Institute of Computer Science' )ДЄnnotationAssertion( rdfs:label :SC 'Supercomputing Center' )

#Owl 2 owl text messaging program full#

NegativeDataPropertyAssertion( :hasEmail :Martin assertion enables to annotate anything with some details, for example we may use ICS as the name of an individualД«ecause it is an abbreviation, and use annotation to label the abbreviation with the full meaning 'Institute of Computer Science'. NegativeObjectPropertyAssertion( :hasSpouse :Martin :Peter) A negative property assertion states that the individual cannot possibly have that property value. OWL uses Open World Assumption, so if an individual is not linked by some property with some value, it may be caused by two reasons - either it really does not have the property with the value, or it is unknown because the information missing from the ontology. Negative property assertion states that the relation of an individual to either data or individual does not exist. ObjectPropertyAssertion( :hasSpouse :Martin :Lenka ) Property assertion states the relation of an individual to either data or individual:ДataPropertyAssertion( :hasEmail :Martin ) Property declaration defines either a data property to link an individual to data, or object property to link to an individual:Дeclaration( ObjectProperty( :hasSpouse ) ) Subclass assertion declares that all individuals that belong to a class belong also to another class. Individual declaration defines a named individual.Дeclaration( NamedIndividual( :Martin ) )Д¬lass assertion state that an individual belongs to a class:

Let's list them here.Д¬lass declaration defines a class. There are many types of axioms that can be expressed in OWL 2.

I will use the functional syntax format in this tutorial, and in some cases I will show also the Manchester syntax when it is more understandable. The most common is the XML/RDF format, the OWL 2 specification uses the functional syntaxДЇormat, the Protege authors developed a shorter Manchester format, and the most concise format is Turtle. The same axiom can be written in several ways. For example, here is a small ontology with two classes and an individual, which has one data property: I use here the Ontograf images produced by Protege OWL editor. Thing is the ontology meaning, which can be shown in a picture. There are many ways how an OWL ontology can be written, however the important Object properties are binary relations that link To a piece of typed data, like to an xsd:dateTime or xsd:string literal. Data properties are binary relations that link an individual There are two types of properties in OWL ontologies.

We can infer other facts which are implicitly contained in the ontology, for example if an individual Martin is in class Student,ДЄnd the class Student is a subclass of the class Person, a reasoner will infer that Martin is a Person.

#Owl 2 owl text messaging program software#

By using a piece of software called a reasoner OWL ontology is a set of axioms, which provide explicit logical assertions about three types of things -Д¬lasses, individuals and properties.

SWRL rules with custom built-ins for individuals.

SWRL rules with data range restrictions.

#Owl 2 owl text messaging program code#

Using OWL+SWRL ontology and reasoner from Java code.Tools designed for the older OWL version 1, like Protege 3, will not work with the examples. Please note that this page describes OWL version 2, which can be processed only by tools designed for that version,