Leveraging existing Web Frameworks for a SIOC explorer (Scripting for the Semantic Web Workshop 2007)

Digital Enterprise Research Institute www.deri.ie Leveraging existing Web frameworks for a SIOC explorer Benjamin Heitmann and Eyal Oren Digital Enterprise Research Institute, National University of Ireland, Galway Chapter 1  Copyright 2007 Digital Enterprise Research Institute. All rights reserved. www.deri.org

Overview Digital Enterprise Research Institute www.deri.ie Part 1:  Introducing SIOC Enabling Mash-Ups of community focused content  Part 2:  Faceted browsing of community sites Balancing between domain specific and domain agnostic  Part 3:  Reusing existing web frameworks Ruby on Rails meets the Semantic Web  2 of 18 Benjamin Heitmann and Eyal Oren

Use case: tracking a music community ? 4 of 18 Benjamin Heitmann and Eyal Oren

Solving the use case Digital Enterprise Research Institute www.deri.ie Tracking an emerging music community over time   Question: What is happening in the Dubstep scene in Dublin?  Solutions that do not work: Google:  – Sites updated too frequently – Bad results: new and relevant pages get buried due to ranking RSS:  – not all types of sites have RSS – RSS feeds do not include all relevant information 5 of 18 Benjamin Heitmann and Eyal Oren

SIOC: enables community mashups Digital Enterprise Research Institute www.deri.ie linked data: web site exporters microformats (contact, location, event) after aggregation: 6 of 18 Benjamin Heitmann and Eyal Oren

Details: the SIOC ontology Digital Enterprise Research Institute www.deri.ie SIOC allows re-using the data at the center of a  community: content:  – blog and forum posts – wiki pages – freeform text (new types can be defined) topics:  – tags and categories – complex hierarchies possibly with SKOS user relations:  FOAF and openID identities the next SIOC version will be geared towards major  social networking sites and Web 2.0 hub sites 7 of 18 Benjamin Heitmann and Eyal Oren

Exploring SIOC data Digital Enterprise Research Institute www.deri.ie SIOC Explorer  crawls and aggregates SIOC data  allows exploring and browsing  – filter by topic – view posts of a certain day Implements faceted browsing  step-wise filtering of displayed content  filtering works across sites  Available at http://activerdf.org/sioc/  9 of 18 Benjamin Heitmann and Eyal Oren

Filtering demonstration Digital Enterprise Research Institute www.deri.ie 10 of 18 Benjamin Heitmann and Eyal Oren

Faceted browsing done right Digital Enterprise Research Institute www.deri.ie Balance between  domain specific  – only show SIOC forums and SIOC posts – focus user attention domain agnostic  – all other data is used for navigation – use unexpected data as filter – example: use author hobbies @@foaf interests as filter fine tuning: disable a-priori unwanted predicates  complex facets  use entities with multiple properties as filter  example: see all post of a FOAF person with a FOAF  homepage http://eyaloren.org 11 of 18 Benjamin Heitmann and Eyal Oren

Complex facets demonstration Digital Enterprise Research Institute www.deri.ie 12 of 18 Benjamin Heitmann and Eyal Oren

Comparing the nature of Web and Semantic Web applications Digital Enterprise Research Institute www.deri.ie Semantic Web Web applications applications semi-structured and data: schema compliant dynamic arbitrary and schema: fixed evolving single and multiple and data sources: centralised distributed model semantics: closed world open world runtime state: closed system open system 14 of 18 Benjamin Heitmann and Eyal Oren

Frameworks for the Semantic Web? Digital Enterprise Research Institute www.deri.ie enough sophisticated Web ActiveRDF fits transparently   Application Frameworks into the Ruby on Rails exist today: architecture View Controller Model Active Active but: no integration of  Resource RDF Semantic Web libraries into the framework architecture 15 of 18 Benjamin Heitmann and Eyal Oren

ActiveRDF bridges the gaps Digital Enterprise Research Institute www.deri.ie between data models  object oriented access to RDF triples:  eyal.foaf::knows = knud ActiveRDF can provide model objects for Rails  Ruby meta-programming allows ActiveRDF to emulate  open world semantics between developer communities  Semantic Web developers:  – benefit from existing Ruby and Rails ecosystem Web and Web 2.0 developers:  – gain access to Semantic Web infrastructure 16 of 18 Benjamin Heitmann and Eyal Oren

ActiveRDF code examples: Digital Enterprise Research Institute www.deri.ie Model: create a Rails model objects from RDF schema Namespace.register :sioc, 'http://rdfs.org/sioc/ns#'class Controller: application logic access to RDF data class PostController < ApplicationController require_dependency ‘sioc’ def display_all_posts @displayed_posts = SIOC::Post.find_all render :action => ‘list’ end end View: display RDF data in user interface <% @displayed_posts.each do |p| %> <%= p.title %> <% end %> 17 of 18 Benjamin Heitmann and Eyal Oren

Summary Digital Enterprise Research Institute www.deri.ie SIOC explorer  SIOC enables re-use of the data at the centre communities  and social networks The SIOC explorer allows faceted browsing of community  data All data included in the SIOC export can be use for  navigating the community content ActiveRDF  transparently integrates with Ruby on Rails  bridges the gaps between  – Web developers and Semantic Web developers – Semantic Web data model and Ruby scripting 18 of 18 Benjamin Heitmann and Eyal Oren

Leveraging existing Web Frameworks for a SIOC explorer (Scripting for the Semantic Web Workshop 2007)

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