DBpedia Viewer presentation for LDOW 2014

1. DBpedia Viewer
An Integrative Interface for DBpedia
Leveraging the DBpedia Service Eco
System
#LDOW14 #WWW2014
#GSoC2013
Lukovnikov D., Kontokostas D., Stadler C., Hellmann S., Lehmann J.

2. Linked Data
● Perfect for machines
● Not so good for humans
○ Fine granularity (RDF triples)
○ Need to ingest triples
○ What is behind a resource URI?
● Imagine landing on a Pubby page

3. Linked Data @ DBpedia
● DBpedia extracts knowledge from Wikipedia
and publishes it as RDF
● 191 languages in v3.9 (08/13), 15 language
chapters & ~4M entities in English
● Various access points
○ RDF dumps, SPARQL endpoint & Linked Data
● Pubby-Like LD interface as a Virtuoso plugin

5. DBpedia Services - Spotlight

6. DBpedia Services - Lookup

7. LD Tools - RelFinder

8. DBpedia tools - Mappings wiki

9. LD Tools - LODLive

10. LD Tools - Virtuoso fct pluin

11. DBpedia Viewer
● Intuitive & interactive
● Integrative (tools)
○ Triple Action Framework
● Client-based rendering
○ No-JS support (defaults to old interface)
● Reduces information overload on previous
DBpedia UI

12. DBpedia Viewer - Technology
● Data: Virtuoso Triplestore
○ Exposes SPARQL endpoint
● Server: VSP
○ Client bootstrapping
○ Non-Javascript visitors (old UI)
● Client: AngularJS
○ Dynamic UI
○ Direct use of SPARQL endpoint (from JS)

13. DBpedia Viewer - Features
1. Pretty box: short entity summary
2. Search bar: search entities (lookup)
3. Language filtering: primary & fallback
4. Triple filtering : just helpful
5. Shortcuts: just helpful too
6. Previews: preview other resource
7. Maps: shows entity on map
8. Triple Actions: actions bound to triples

14. DBpediaViewer-Features

15. Triple Actions
● Defined by UI maintainer
⇒ easy means to extend UI
○ boilerplate already implemented
● Initially for:
○ user actions → interaction
● Proved useful for:
○ system actions → customization

16. Triple Actions - Main Semantics
● Bind: whether action applicable
○ based on values in triple and action state
● Execute: what to do when invoked
○ go to URL
○ query external resource / service
● State:
○ global: across all action instances
○ local: at one action instance only

17. Triple Actions - Extras
Additional hooks and features:
● Icon display:
○ may depend on state
● Title (ID) & description
● Legend entry

18. DBpedia Viewer - User Actions
● Text Annotation: Spotlight on long texts
● RelFinder: relationship finder tool
● LodLive & Virtuoso fct: alternative browsers
● Wikipedia: view source page
● Mappings Wiki: view mappings wiki page
⇒ may use any of the (subject, predicate, object) from a
triple

19. DBpedia Viewer - System actions
● Invisible to users
● Populate UI elements based on data
○ owl:sameAs → filter → pretty box
○ geocoordinates → show in map
● Implement data-triggered functionality
○ :wikiPageRedirects ⇒ redirect page

20. Conclusion
● Interactive additions and layout choices may
improve comprehensibility of data
○ While keeping the Linked Data philosophy
● JS with SPARQL via AJAX
○ Page construction in client → less server-side load
● Triple Actions
○ Easy customization (system actions)
○ More interaction (user actions)

21. Possible future
● Generalization for all datasets (LD Viewer)
● New actions
○ Push triple to Wikidata
○ Triple validation
● User behavior analysis for
○ Entity summarization
○ Entity ranking

22. ASK
{ :Audience :hasQuestion ?q }
Sponsored by GSoC 2013https://github.com/dbpedia/dbpedia-vad-i18n