GSOC2013_Progress_Denis

on GSoC: http://www.google-melange.com/gsoc/project/google/gsoc2013/lukovnikov/48001

Project

DBpedia Viewer

Mentors:

• Claus Stadler
• Dimitris Kontokostas
• Sebastian Hellmann

Progress

see also dbpv.wordpress.com

Warming up:

Set up DBpedia mirror: DONE

• DBpedia datasets import (blogpost):
  • Opensource Virtuoso server up and running locally
  • imported most English DBpedia 3.8 datasets (except pagelinks and some problematic datasets)

Install DBpedia plugin in Virtuoso: TODO (next)

Work:

AngularJS:

• Researched AngularJS and BackboneJS. AngularJS seems more powerful, but also heavier and "opiniated".
  • I like how the pieces work together in AngularJS better than in BackboneJS
  • AngularJS has an explicit Controller and is actually a MVC (unlike Backbone)
  • but still needs some research (e.g. hashless routing)
• Got AngularJS working to fetch entities from DBpedia SPARQL endpoints and results from the Lookup service. Still very basic, but AngularJS works. Routing with hash works.

[end July 8]

• Got querying the SPARQL endpoint working with Angular's $http through POST requests (to avoid possible errors due to 1900 char limit of Virtuoso URLs). Although, at first, it seemed to work properly only on live.dbpedia.org (will check again).
• Using a double SELECT query instead of DESCRIBE now to get all triples about some entity dbpedia:X:

SELECT ?hasProperty ?value ?isProperty
WHERE {
   {<http://dbpedia.org/resource/X> ?hasProperty ?value} 
    UNION 
   {?value ?isProperty <http://dbpedia.org/resource/X>}
}

• enabled hashless routing (HTML5 pushdown)
  • will go back to hash-routing when HTML5 history not supported
• did a test on how to combine hash(less) routing of AngularJS with noscript (this is not yet RDFa scraping)
  • test succeeded