OWLGrEd Ontology Visualizer

Institute of Mathematics and Computer Science (IMCS) University of Latvia

Renārs Liepiņš - Mikus Grasmanis - Uldis Bojārs (CaptSolo)

ISWC 2014 Developers Workshop

Online ontology visualizer

http://owlgred.lumii.lv/online_visualization

• compact graphical notation for OWL 2– based on UML– OWL class expressions in diagram elements– Manchester OWL Syntax for class expressions

• more info re. OWLGrEd notation:– http://owlgred.lumii.lv/notation

Ontology uploads (last 4 months): >700

http://owlgred.lumii.lv/online_visualization/koala.owl

http://owlgred.lumii.lv/online_visualization/koala.owl

koala.owl

OWL APIcalls

diagram descriptionin JSON

diagram drawing(canvas)

server side running in JVM:Clojure + Java

Graph generation module

• data transformation pipeline– functional programming approach– graph generation module = implemented in Clojure

• uses OWL API to read the ontology

• generates diagram description (in JSON)– ordered list of ~70 transformation rules– match OWL axioms -> generate diagram elements

• applies styling information– style configuration file

Layout module:• calculate optimal layout

based on diagram description

• enrich JSON description with layout information

• implemented in Java

Visualization:• read diagram JSON

• generate interactive visualization (zoom, pan, select)– HTML5 canvas

• based on KineticJS

Future Ideas

• Ontology verbalization– http://userstudies.lumii.lv/g/owlgred-cnl/extverb_on

• Ontology editing

• Move from canvas to vector graphics

• Visualization publication and sharing

More info• OWLGrEd Ontology Visualizer paper– http://ceur-ws.org/Vol-1268/

• OWLGrEd publications– http://owlgred.lumii.lv/

research_and_development

• E-mail us your ideas & questions– uldis.bojars@gmail.com - @CaptSolo– owlgred@lumii.lv