A Protégé Desktop plugin that enables users to specify defeasible subclass axioms and compute "typical" superclasses and instances for a given class expression. The plugin is split into two parts: 1) the tab plugin net.za.cair.dip.jar and 2) an optional extension of Protégé's editor plugin protege-owl-editor.jar that enables users to toggle subclass axioms to be defeasible.

Requirements:

• Protégé Desktop
• Java 1.8

Steps:

1. If Protégé is open, close it.

2. Copy net.za.cair.dip-${version}.jar, in the releases section of this repository, to the plugins/ subdirectory of your Protégé Desktop installation.

3. Optional: if you would like to add a button to subclass axioms in Protégé allowing you to automatically toggle axioms to be defeasible, replace protege-editor-owl.jar in the bundles/ directory of your Protégé Desktop installation with the version in the releases section of this repository. Backup the original protege-editor-owl.jar so you can revert back to it if you encounter any issues with the new file.

4. Fire up Protégé and consult the wiki section of this repository to learn how to use the DIP plugin.

Note: DIP uses the currently selected traditional OWL reasoner (from the Reasoner menu in Protégé) in its defeasible reasoning algorithms. Theoretically, you can select any reasoner suitable for the Description Logic (DL) used to formulate your ontology. However, in practice, OWL reasoners can differ in how they implement the OWLReasoner interface in the OWLAPI. For example, some reasoners will not update their inferences after an ontology changes unless the "classify" method is invoked explicitly. HermiT does not have this issue, and is the recommended choice to use in conjunction with DIP.

Frequently Asked Questions (FAQs)

Requirements:

• Apache's Maven.
• A tool for checking out a Git repository.

Steps:

1. Get a copy of the code:

    git clone https://github.com/kodymoodley/defeasibleinferenceplatform.git
   

2. Change into the defeasibleinferenceplatform/ directory.

3. Type mvn clean package. On build completion, the target/ directory will contain a net.za.cair.dip-${version}.jar file.