Definition#

An ontology is created in a similar way as a d3web knowledge base using the ontology markup.

%%Ontology 
  @uses: myPackageName
%

For the name myPackageName please use the name of the package that you used for the ontology definitions.

Creating Ontology Entities within the Local Namespace#

Ontologies in KnowWE are based on the RDF standard (http://www.w3.org/TR/REC-rdf-syntax/). In RDF every resource is identified by a full qualified URI name. For brevity, KnowWE uses shortened identifier such as rdf for http://www.w3.org/1999/02/22-rdf-syntax-ns#. The resource http://www.w3.org/1999/02/22-rdf-syntax-ns#type therefore is called rdf:type in KnowWE. Ontology entities newly created within the wiki are created in the ontology repository under the so-called local namespace, that is the URL referring to the wiki installation URL. On the wiki pages, the local namespace (lns) is ommitted.

Example#

The following example defines the package name myPackageName and creates a new ontology using this package.

%%Ontology
@uses: myPackageName
%

%%Package myPackageName

%%Turtle 
:System rdf:type owl:Class .

:KnowWE rdf:type :System ; 
    rdfs:label "KnowWE Wiki" .
%

On the same page, the Turtle markup is used to define an owl:Class System (in the local namespace) and an instance of System with the name KnowWE. Additionally, the label "KnowWE Wiki" is defined.

Importing existing ontologies into a KnowWE ontology#

By attaching an ontology-file to this page (containing the ontology in any standard ontology format) an ontology can be imported into the KnowWE ontology repository as follows:

%%Ontology 
@import: movie-ontology.owl
%

Note: For this example a file named movie-ontology.owl needs to be attached to this page!

See Also #

The following markups can be used to create ontology entities (under local namespace if the namespace prefix is omitted):

Beside the local namespace, also other namespaces may freely be defined using the Namespace markup. For sparql queries in the SPARQL markup, always a namespace needs to be defined (including lns: for the local namespace) for triple patterns of a query.

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This page (revision-24) was last changed on 10-Feb-2017 10:50 by Albrecht Striffler