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 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.
