Sharing and Reusing Visualizations for the Web of Data with the RDFS/OWL Visualization Language (RVL)

Presentation + Demo Sharing and Reusing Visualizations for the Web of Data with the RDFS/OWL Visualization Language (RVL)

Jan Polowinski, Herrenhäuser Symposium Visual Linguistics, Hannover, 20.11.2014 [email protected] twitter: janpolowinski

TU Dresden / SMT / Softwaretechnology Group

Overall Goals and Further Thoughts

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Visualization Author Visualization authors can share and reuse „good“ visualization settings and take their settings to other tools!

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Domain ontology authors can propose visualization settings!

Mappings should be consise and declarative

then the Mappings should be composable!

The specifics of RDFS and OWL should be considered!

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Outline

1 – Overview on RVL 2 – Demo 3 – Feedback

1 – Overview on RVL

4/25 RVL: A Language for RDFS/OWL Visualisation

Complete Example – Composed Mapping

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Modelling Linking with Roles

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Modelling Containment with Roles

(De)Composing Graphics Using Syntactic Roles

A syntactic role is a role that a graphic object may play within a syntactic structure. We distinguish [...] node, label, connector, separator, container, point locator, line locator, surface locator, volume locator, metric bar, and grid line.

•  „Syntactic roles“ used by Engelhardt for analysis •  We try to use them for synthesis ( composition)

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„

“ Engelhardt, 2002: „The Language of Graphics“. Institute for Logic, Language &

Computation, University of Amsterdam.

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Eng

elha

rdt,

von,

Jör

g. „

The

Lan

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nstit

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for

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angu

age

& C

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of

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dam

., 20

02.

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Last Slide! à Live Demo (Visualizing Works of Tolkien)

Property Mappings


Value Mappings

•  Simple case: 1-to-1 explicit, manual mapping of discrete values

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common-‐shapes: Star

common-‐shapes: Circle

common-‐shapes: Triangle

ex:EventClass

ex:Loca9onClass

ex:PersonClass

VA

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MA

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PR

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Value Mappings

•  Simple case: 1-to-1 explicit, manual mapping of discrete values

•  Calculated value mappings •  Default: map whole range of

source values to the whole range of target values

•  Source and target values can be refined ...

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RVL – Main Constructs

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Conclusion [WIP]

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Conclusion [WIP]

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Mappings should be consise and declarative

The specifics of RDFS and OWL should be considered!

Why not use Fresnel or CSS? Do we need more?

YES! But reuse.

Conclusion [WIP]

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Visualization authors can share and reuse „good“ visualization settings and take their settings to other tools!

Domain ontology authors can propose visualization settings!

Mappings stored just like the data - in RDF.

Conclusion [WIP]

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then the Mappings should be composable!

?

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3 – Future Work

•  Graph Transformation-based implementation •  Consider the experiences from Hypergraph approaches [Minas,

2000; Bardohl, 2000]

Future Work (for you - if you like) •  Reuse VISO! •  Look at the RVL Example-Suite

•  http://www-st.inf.tu-dresden.de/semvis/blog/?page_id=287

•  Fork RVL at github •  https://github.com/janpolowinski/rvl

Acknowledgements

•  This research has been co-funded by the European Social Fond / Free State of Saxony, contract no. 80937064 and 1330674013 (eScience – network).

•  Example data for the demo has been prepared in the context of my work for the Saxony State and University Library Dresden (SLUB)

25/26 BACKUP SLIDES à

Literature

•  Engelhardt, von, Jörg. „The Language of Graphics“. Institute for Logic, Language & Computation, University of Amsterdam., 2002.

•  Minas, „Hypergraphs as a uniform diagram representation model“, 2000. •  Bardohl, GENGED visual definition of visual languages: based on algebraic graph

transformation“, 2000.

•  RVL: Visualization-Ontology: http://purl.org/rvl/ •  Source: https://github.com/janpolowinski/rvl •  Wiki: https://github.com/semvis/rvl/wiki/ •  Blog: http://www-st.inf.tu-dresden.de/semvis/blog/

•  VISO Visualization-Ontology: http://purl.org/viso/graphic/

26/26 BACKUP SLIDES à

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3 – Feedback

[also look at the following backup slides for further background information on RVL, VISO and the usage context]

BACKUP SLIDES

OntoWiki-based Prototype for RVL editing, driven by RVL constraints defined in SPIN (MA thesis, Pooran Patel)

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TopBraid Composer-based Prototype, driven by the same RVL constraints defined in SPIN (Jan Polowinski, 2010)

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Context – usage of RVL as part of the OGVIC approach for Ontology-driven Guided Visualisation supporting Composable Mappings

Analysis preceeding the specification of RVL: What‘s in the Data? What can we map?

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Analysis II: Which Graphics Could be Built with the New (Ontological) Data?

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Graphic Attributes and Graphic-Object-to-Object-Relations in the Visualization Ontology (VISO)

à Formalised as VISO Ontology http://purl.org/viso/

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Graphic Attributes (GA) •  Lightness, Shape, Size, Named Colors

Graphic-Object-to-Object-Relations (GOTOR) •  Linking Undirected •  Relative Position •  Separation by a Separator

Calculation of Value Mappings in RVL

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Work of Minas and Bardohl on Hypergraphs and GT in the field of diagrams and visual languages

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„Hypergraphs as a uniform diagram representation model“ (Minas, 2000) „GENGED visual definition of visual languages: based on algebraic graph transformation“ (Bardohl, 2000)

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0): 4

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Technology

Sharing and Reusing Visualizations for the Web of Data with the RDFS/OWL Visualization Language (RVL)