Site Interoperability Projects at DERI Galway's SW Cluster

John Breslin (for Stefan Decker) Site Interoperability Projects at DERI Galway‘s SW Cluster [email_address] www.johnbreslin.com Interop Issues in SW Sites 7 th February 2005

SW Cluster: Overview
SIOC: Semantically Interlinked Online Community
SemanticWeb.org
FOAFRealm
RDF Datasets for Site Exchange

SIOC: Introduction
Issues with online communities:
Data on community sites cannot be harnessed correctly
Isolated communities discussing complementary topics
Information is being repeatedly requested across sites
SIOC approach:
Ontology
Data Interface
Inferring Connections

SIOC: To Interconnect Bulletin Board Sites
boards.ie
boards.us
boards.jp
boards.geek.nz

SIOC: Ontology
Namespace at
rdfs.org/sioc/ns#

SIOC: Data Interface (galway +broadband +linux)

SIOC: Inferring Connections

SemanticWeb.org
FOAFRealm

SemanticWeb.org: Introduction
General interoperability considerations
The site
RDF/XML views of local data
Integration of remote data
Data access interface
Ontology import and export
Possible extensions

SemanticWeb.org: General Interop Considerations
Basic idea is to use Semantic Web technology to allow different web sites to „work together“
Interoperability could cover re-use and integration of other sites‘ models , data , and functionality
Presentation layer components (e.g. stylesheets for agreed-on RDF/XML structures) may be considered too

SemanticWeb.org: The Site
SemanticWeb.org will (soon again ;-)) be the Semantic Web community portal
The new (RDF-enhanced) site will provide information about Semantic Web events, people, tools, organisations, projects, and other related resources
Both instance data and model information can be added, modified, extended, and exported online

SemanticWeb.org: Architecture

SemanticWeb.org: RDF/XML Views of Local Data
Each portal object (page, channel, blog post, user, vocabulary, SKOS concept, resource description...) can be serialized as RDF/XML
Resource Description Discovery (RDD) will be enabled by <link /> tags in XHTML, HTTP headers (X-Metadata-Location) and support for URIQA‘s MGET
Direct serving of content-negotiated XHTML vs. RDF/XML is considered bad practice (URI overloading etc.), but HTTP redirects may be triggered on certain accept-headers instead

SemanticWeb.org: Integration of Remote Data
The site has an „Add URL“ feature to add remotely maintained sources to the portal
Information from remote sources will be updated via an RDF crawler (scutter)
The final RDF store (Andreas‘ YARS) is going to support HTTP PUT and POST for direct integration of data

SemanticWeb.org: Data Access Interface
The final portal is going to provide an HTTP-based query interface (probably SPARQL protocol/query language compliant)
Together with the portal‘s RDD features, it will be possible to retrieve Concise Bounded Descriptions (CBDs) of resources for re-use in other environments

SemanticWeb.org: Ontology Import and Export
The portal system has a built-in web-based vocabulary editor and publisher
RDFS and OWL term sets can be imported, mixed, and exported
Annotation properties are used to add machine-readable presentation information for classes (e.g. re-usable views or forms)

SemanticWeb.org: Administration Screenshot

SemanticWeb.org: Possible Extensions
Add support for functionality re-use (e.g. facilitated sign-up à la FOAFNet)
The views are currently generated via PHP code (ontology-guided, though)
For improved interoperability, it could make sense to completely separate the presentation layer from program code (e.g. by a stylesheet-like approach and by formally describing the way resource descriptions should be displayed)

SemanticWeb.org
FOAFRealm

FOAFRealm: Introduction
A user management system with social collaborative filtering
Embedded mechanisms of authorising and controlling the sharing of resources among users
Gives different weights of votes during negotiations

FOAFRealm: Features
User profiles management system based on FOAF and P2P
Information on relationships between users
On-time registration*
Single sign-on*
Access control lists based on the distance and trust level between users
Implementation of social collaborative filtering (private bookshelves, annotations, evaluations)

FOAFRealm: Architecture
Multi-tiered architecture
RDF storage independent
Can be adapted to environments other than Jakarta Tomcat
RDF Storage FOAF Manage FOAF Realm (Authentication Plugins) User Interface Guidelines

FOAFRealm: Types of Collaborative Filtering

FOAFRealm: Social Collaborative Filtering

FOAFRealm: Security in Collaborative Filtering

FOAFRealm: Calculating Interests

FOAFRealm: Related Projects
JeromeDL – e-Library with Semantics:
FOAFRealm as a user management subsystem
Additional layer of P2P communication between instances of the digital library
Collaborative filtering as one of the semantically enhanced search services
MarcOnt Initiative:
FOAFRealm as user management subsystem
Calculating distances between community members
MarcOnt ontology considered to cover collaborative aspects

FOAFRealm: JeromeDL User Profile

FOAFRealm: JeromeDL Screenshot

RDF Datasets for Site Exchange: Andreas
DBLP metadata about 600,000 CS journal papers, conference proceedings (~400 MB)
Cleaned-up version of dmoz.org, a human-edited directory of the web (~1.2 GB)
Recent semantic web crawl (~300 MB) consisting mostly of RSS 1.0, DC, FOAF, DOAP, and image annotations

SW Cluster: Conclusion
SemanticWeb.org
FOAFRealm
Thanks for your attention!
http://sw.deri.org/

Site Interoperability Projects at DERI Galway's SW Cluster

by John Breslin on Oct 24, 2007

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Site Interoperability Projects at DERI Galway’s SW Cluster — Presentation Transcript