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Classes are the base of an ontology, all stored resources must define themselves as "being" at least one of these classes. They all derive from the base rdfs:Resource type. To eg. define classes representing animals and plants, you can do:
<xi:include></xi:include>
By convention all classes use CamelCase names, although class names are not restricted. The allowed charset is UTF-8.
Declaring subclasses is possible:
<xi:include></xi:include>
With such classes defined, resources may be inserted to the endpoint, eg. with the SPARQL:
<xi:include></xi:include>
Note that multiple inheritance is possible, resources will just inherit all properties from all classes and superclasses.