[{TableOfContents }]

!!! 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|Doc 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|Doc 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):

* [Turtle| Doc Turtle]
* [Class| Doc Class]
* [Individual| Doc Individual]
* [ObjectProperty| Doc ObjectProperty]
* [Relation| Doc Relation]


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