Olis Ontology

Overview

The Olis ontology is a model of virtual and real RDF Named Graphs and relations between them.

It defines only a few classes and a few predicates.

RDF

The ontology RDF is available here.

Validator

A SHACL validator for this ontology is here.

Classes

Named Graph

https://olis.dev/NamedGraph

An RDF Named Graph, as per RDF 1.2's definition.

Real Graph

https://olis.dev/RealGraph

A Named Graph that contains triples.

Example:

PREFIX : <https://olis.dev/>
PREFIX ex: <http://example.com>
PREFIX gr: <http://olis.dev/GraphRoles/>
PREFIX schema: <https://schema.org/>

ex:realGraphX
    a :RealGraph ;
    :hasGraphRole gr:Original ;
    schema:name "Real Graph X" ;
    schema:description "A real graph, containing triples about ..." ;
.

ex:realGraphY
    a :RealGraph ;
    :hasGraphRole gr:Inferred ;
    :hasBaseGraph ex:realGraphX ;
    schema:name "Real Graph Y" ;
    schema:description "A real graph, containing triples inferred from Real Graph X" ;
.

ex:virtualGraphZ
    a :VirtualGraph ;
    schema:name "Virtual Graph Z" ;
    schema:description "A Virtual Graph that includes Real Graphs X & Y" ;
    :includes ex:realGraphX , ex:realGraphY ;
.

Virtual Graph

https://olis.dev/VirtualGraph

A Named Graph that does not and cannot contain triples but which may be related to Real Graphs.

Predicates

includes

https://olis.dev/includes

The subject Virtual Graph includes the object Named Graph.

has base graph

https://olis.dev/hasBaseGraph

The subject Real Graph is derived from, or to be added to, the object Named Graph.

has graph role

https://olis.dev/hasGraphRole

The subject Real Graph plays the object Olis Graph Role.

has rules graph

https://olis.dev/hasRuleGraph

The subject Real Graph was generated by the application of the object Real Graph, which are rules, to the object of the subject's olis:hasBaseGraph predicate.

Example:

PREFIX : <https://olis.dev/>
PREFIX ex: <http://example.com>
PREFIX gr: <http://olis.dev/GraphRoles/>

ex:realGraphX
    a :RealGraph ;
    :hasGraphRole gr:Original ;
.

ex:realGraphY
    a :RealGraph ;
    :hasGraphRole gr:Inferred ;
    :hasBaseGraph ex:realGraphX ;
    :hasRulesGraph ex:realGraphZ ;
.

ex:realGraphZ
    a :RealGraph ;
    :hasGraphRole gr:Rules ;
.

Extended Example

In this extended example, the Virtual Graph X includes two other Virtual Graphs and a Real Graph. The contained Virtual Graphs contain other Real Graphs.

Real Graph A is the base graph for RGs B, C & D meaning they are all related.

Real Graphs E & F both have the Olis Graph Role of Original so they are essentially unrelated to one another.

Real Graph G indicates no role so it is assumed to have the default role of Original.

PREFIX : <https://olis.dev/>
PREFIX ex: <http://example.com>
PREFIX gr: <http://olis.dev/GraphRoles/>
PREFIX schema: <https://schema.org/>

ex:virtualGraphX
    a :RealGraph ;
    :includes 
        ex:virtualGraphY ,
        ex:virtualGraphZ ;
.

ex:virtualGraphY
    a :RealGraph ;
    :includes 
        ex:realGraphA ,
        ex:realGraphB ,
        ex:realGraphC ,
        ex:realGraphD ;
.

ex:virtualGraphZ
    a :RealGraph ;
    :includes 
        ex:realGraphE ,
        ex:realGraphF ,
.

ex:realGraphA
    a :RealGraph ;
    :hasGraphRole gr:Original ;
.

ex:realGraphB
    a :RealGraph ;
    :hasGraphRole gr:Inferred ;
    :hasBaseGraph ex:realGraphA ;
.

ex:realGraphC
    a :RealGraph ;
    :hasGraphRole gr:Added ;
    :hasBaseGraph ex:realGraphA ;
.

ex:realGraphD
    a :RealGraph ;
    :hasGraphRole gr:Removed ;
    :hasBaseGraph ex:realGraphA ;
.

ex:realGraphE
    a :RealGraph ;
    :hasGraphRole gr:Original ;
.

ex:realGraphF
    a :RealGraph ;
    :hasGraphRole gr:Original ;
.

ex:realGraphG
    a :RealGraph ;
.