Online OWL ontology visualizer talk presented at the ISWC 2014 Developers workshop. Visualizer: http://owlgred.lumii.lv/online_visualization Paper: http://ceur-ws.org/Vol-1268/paper7.pdf Event: http://iswc2014.semdev.org/program/

1. OWLGrEd Ontology Visualizer
Institute of Mathematics and Computer Science (IMCS)
University of Latvia
Renārs Liepiņš - Mikus Grasmanis - Uldis Bojārs (CaptSolo)
ISWC 2014 Developers Workshop

2. 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

3. Ontology uploads (last 4 months): >700

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

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

6. koala.owl
OWL API
calls
diagram
description
in JSON
diagram drawing
(canvas)
server side running in JVM:
Clojure + Java

7. 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

9. 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

10. 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

11. More info
• OWLGrEd Ontology Visualizer paper
– http://ceur-ws.org/Vol-1268/
• OWLGrEd publications
– http://owlgred.lumii.lv/research_and_develop
ment
• E-mail us your ideas & questions
– uldis.bojars@gmail.com - @CaptSolo
– owlgred@lumii.lv