# ont-app/igraph-jena

This is a port of the Jena APIs to the IGraph protocol.

Part of the ont-app library, dedicated to Ontology-driven development.

Usage

Require thus:

(ns my-ns
  (:require 
    [ont-app.igraph-jena.core :as jgraph])
  (:import 
    ;; any Jena-specific stuff
    ))

Creating a graph:

Create the graph thus:

With no arguments (returns a Jena default model):

> (def g (jgraph/make-jena-graph))
> (type (:model g))
org.apache.jena.rdf.model.impl.ModelCom
> 

We can specify a file

> (def g (jgraph/make-jena-graph (RDFDataMgr/loadModel "resources/test-data.ttl"))

Or equivalently use the read-rdf function:

> (def g (jgraph/read-rdf "resources/test-data.ttl"))

If we have an existing Jena Model, we can define an IGgraph wrapper around it:

> (def g (jgraph/make-jena-graph <existing-jena-model>))

... or if we have a Jena DataSet and the name of a graph (nil for default graph):

> (def g (jgraph/make-jena-graph <existing-dataset> <graph-name-or-nil>))

Member access and manipulation

Then apply the standard methods for IGraph member access, with mutable member manipulation operations add! and subtract!.

For example:

> (g :eg/Thing2)
{:eg/number #{2},
 :rdfs/label #{#lstr "Thing 2@en"},
 :rdf/type #{:eg/Thing}}
> 
> (g :eg/Thing2 :eg/number)
#{2}
>
> (g :eg/Thing2 :eg/number 2)
true
> 
> (add! g [[:eg/Thing3 :rdf/type :eg/Thing]
           [:eg/Thing3 :rdfs/label #lstr"Thing3@en"]
           [:eg/Thing3 :rdf/number 3]])
            

Set the IGraph docs for more details.

Serializing output

> (write-rdf g "/tmp/testing.ttl" "turtle")
> 

License

Copyright © 2020-21 Eric D. Scott

This program and the accompanying materials are made available under the terms of the Eclipse Public License 2.0 which is available at http://www.eclipse.org/legal/epl-2.0.

This Source Code may also be made available under the following Secondary Licenses when the conditions for such availability set forth in the Eclipse Public License, v. 2.0 are satisfied: GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version, with the GNU Classpath Exception which is available at https://www.gnu.org/software/classpath/license.html.

Natural Lexicon logo - Copyright © 2020 Eric D. Scott. Artwork by Athena M. Scott. Released under Creative Commons Attribution-ShareAlike 4.0 International license. Under the terms of this license, if you display this logo or derivates thereof, you must include an attribution to the original source, with a link to https://github.com/ont-app, or http://ericdscott.com.