Databases Reference
In-Depth Information
Fig. 31.
The DL-Learner plugin can be invoked from the context menu of a class in OntoWiki
The OntoWiki Plugin.
Analogous to Protégé, we created a similar plugin for On-
toWiki (cf. section 4). OntoWiki is a lightweight ontology editor, which allows dis-
tributed and collaborative editing of knowledge bases. It focuses on wiki-like, simple
and intuitive authoring of semantic content, e.g. through inline editing of RDF content,
and provides di
ff
erent views on instance data.
Recently, a fine-grained plugin mechanism and extensions architecture was added to
OntoWiki. The DL-Learner plugin is technically realised by implementing an OntoWiki
component, which contains the core functionality, and a module, which implements the
UI embedding. The DL-Learner plugin can be invoked from several places in OntoWiki,
for instance through the context menu of classes as shown in Figure 31.
The plugin accesses DL-Learner functionality through its WSDL-based web service
interface. Jar files containing all necessary libraries are provided by the plugin. If a user
invokes the plugin, it scans whether the web service is online at its default address. If
not, it is started automatically.
Fig. 32.
Extraction with three starting instances. The circles represent di
ff
erent recursion depths.
The circles around the starting instances signify recursion depth 0. The larger inner circle rep-
resents the fragment with recursion depth 1 and the largest outer circle with recursion depth 2.
Figure taken from [56].
