Tutorial: Ontology Development
Contents
Step 1: Ontology Plug-in
Ontologies are encapsulated in OSGi bundles. In eclipse we develop them as equinox plug-ins. It contains ontology sources (graph/*.pgraph), compiled graph file (graph.tg), and Java resource files (src and bin).
Open a New Plug-in Project wizard:
- Select File >> New >> Plug-in Development >> Plug-in Project
Our organization is Acme Software ltd and from there is our plug-in name derived, com.acme.movie.ontology. Insert that as project name. In the following page you should know that this plugin does not contribute to UI, does not need activator or isn't a rich client application.
Setup Graph Building Nature
Next, add Graph builder into the project nature. You need to modify a file called workspace/com.acme.movie.ontology/.project, and to do this Eclipse must be closed for changes to apply.
The file look like this:
<?xml version="1.0" encoding="UTF-8"?> <projectDescription> <name>com.acme.movie.ontology</name> <comment></comment> <projects> </projects> <buildSpec> <buildCommand> <name>org.eclipse.jdt.core.javabuilder</name> <arguments> </arguments> </buildCommand> <buildCommand> <name>org.eclipse.pde.ManifestBuilder</name> <arguments> </arguments> </buildCommand> <buildCommand> <name>org.eclipse.pde.SchemaBuilder</name> <arguments> </arguments> </buildCommand> </buildSpec> <natures> <nature>org.eclipse.pde.PluginNature</nature> <nature>org.eclipse.jdt.core.javanature</nature> </natures> </projectDescription>
Add the following insertions:
<buildSpec> <buildCommand> <name>org.simantics.graph.builder</name> <arguments> </arguments> </buildCommand> ...
and
<natures> <nature>org.simantics.graph.nature</nature> ...
Good, fire up the Eclipse again. If everything went well "Graph Builder" ought to be visibile in the properties of the project file. Like so:
Also create dictory called graphs, and there a file Movie.pgraph.
Configure MANIFEST.MF
Your ontology well depend on Layer0, so open META-INF/MANIFEST.MF in a editor and add org.simantics.layer0 to plug-in dependencies.
Also, you are going to
- Export package com.acme.movie.ontology
Your MANIFEST.MF should look like this.
Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-Name: Ontology Bundle-SymbolicName: com.acme.movie.ontology Bundle-Version: 1.0.0.qualifier Bundle-Vendor: ACME Bundle-RequiredExecutionEnvironment: JavaSE-1.6 Require-Bundle: org.simantics.layer0;bundle-version="1.0.0" Export-Package: com.acme.movie.ontology
Developing the ontology
Open Movie.pgraph and start editing.