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StarLion: Auto-configurable Layouts for Exploring Ontologies

StarLion offers an innovative approach to exploring complex RDFS ontologies through auto-configurable layouts. By utilizing Star Views, users can incrementally focus on specific classes while visualizing their related connections in star-like graphs. Our method incorporates a configurable force-directed placement algorithm that adapts to the unique characteristics of each graph. This approach significantly enhances the user's understanding of large ontologies by facilitating the exploration of ontology dependencies and providing automatic quality adjustments via a "Magic Button."

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StarLion: Auto-configurable Layouts for Exploring Ontologies

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  1. StarLion: Auto-configurable Layouts forExploring Ontologies Stamatis Zampetakis, Yannis Tzitzikas, Asterios Leonidis, and Dimitris Kotzinos Institute of Computer Science, FORTH-ICS, Greece, and Computer Science Department, University of Crete, Greece

  2. Outline • Motivation • StarLion • Exploration Method • Layout Algorithm • Ontology Dependencies • Conclusion ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  3. Motivation • It is difficult to understand a big RDFS ontology, even if it is visualized (here as a labeled directed graph) ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  4.  Exploration through Star Views StarView on class Actor with radius 1 • We propose exploring gradually the ontology through StarViews • the user selects one class c as a focal point. Class c along with all related classes in distance (radius) k from c are visualized creating Star-like graphs ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  5. Exploration through Star GraphsExample Cidoc CRM Ontology ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  6. Exploration through Star GraphsExample (cont) Click on E30 Right StarView On Class Actor with Radius 1 StarView on E39 Actor with Radius = 1 ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  7. Exploration through Star GraphsExample (cont) StarView on Class Right with radius 1 StarView on E30 Right with Radius = 1 ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  8. Exploration through Star GraphsExample (cont): Increasing the Radius StarView on E30 Right with Radius = 2 StarView on Class Right with radius 2 ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  9. Exploration through Star GraphsExample : Data Visualization • StarViews can also be used for data exploration • data usually come in big volumes which cannot be visualized altogether ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  10. How to layout these graphs? Observations and Requirements • Every graph has different features: • Different number of nodes, edges, isA (subclass-superclass) relations • The layout algorithm that will be used, must be configurable for adapting to every occasion Our approach  Adopt a force-directed placement algorithm (FDPA) and focus on the configuration of its parameters ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  11. A force-directed placement algorithm for RDFS We view an RDF schema as a mechanical system worksAt Person company Person company subClassOf subClassOf Manager Secretary Manager Secretary Magnet Magnetic Field Electrical Repulsion ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  12. A force-directed placement algorithm for RDFS >Configuration •  Our approach • A toolbar for relative configuration • A “Magic button” • quality metrics and automatic configuration • FDPA has three parameters that affect the produced layout • Km – magnetic field strength • Ke – repulsion strength • L – spring length ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  13. Configuring the ParametersToolbar for Relative Configuration ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  14. Configuring the ParametersThe “Magic Button” • It measures the quality of the layout based on two metrics • Verticality of specialization hierarchies and • Layout area • Then it re-adjusts the configuration parameters for improving the layout ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  15. Configuring the ParametersThe “Magic Button”> Example The layout with a simple application of the FDPA without any configuration ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  16. Configuring the ParametersThe “Magic Button”> Example After 1 application of the FDPA with automatic configuration ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  17. Configuring the ParametersThe “Magic Button”> Example After 2 applications of the FDPA with automatic configuration ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  18. Visualization of Ontology Dependencies • Ontologies usually extend other ontologies • In most cases visualizing parts of the related ontologies is crucial for the understanding of the main ontology • Our Approach We support three options for the visualization of an ontology’s dependencies • Direct Dependencies: Main ontology + Only the directly connected elements from the other related ontologies • Transitive Dependencies: Main ontology + Directly connected elements from the other related ontologies along with their superclasses • Full Dependencies: Visualize all related ontologies entirely ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  19. Visualization of Dependent Namespaces> Example Example: Cidoc CRM Ditital Ontology extends Cidoc CRM Ontology adding six new classes and a few properties Cidoc CRM Ontology Extends By visualizing Cidoc CRM Digital Ontology alone we get: Cidoc CRM Digital Ontology By visualizing Cidoc CRM Digital Ontology taking into account its dependency we get. ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  20. Conclusion • In comparison with related works and systems: • Most of them do not support variable radius in StarView • None of them uses a FDPA that takes into account the subClassOf hierarchies • Most of them do not allow configuring the FDPA parameters • They do not support auto-configuration of the FDPA parameters • They do not exploit dependencies between ontologies in the visualization ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

  21. Thanks for your attention ESWC'10 StarLion:Auto-configurable Layouts for Exploring Ontologies

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