Social Semantic Web Tools & Methods Philipp Frischmuth AKSW, - - PowerPoint PPT Presentation

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Social Semantic Web Tools & Methods Philipp Frischmuth AKSW, - - PowerPoint PPT Presentation

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Creating Knowledge out of Interlinked Data Social Semantic Web Tools & Methods Philipp Frischmuth AKSW, Universitt Leipzig LOD2 Presentation . 02.09.2010 . Page http://lod2.eu Creating Knowledge out of Interlinked Data Agenda

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Creating Knowledge out of Interlinked Data

LOD2 Presentation . 02.09.2010 . Page http://lod2.eu

AKSW, Universität Leipzig

Philipp Frischmuth Tools & Methods

Social Semantic Web

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Agenda

Introduction Distributed Semantic Social Network

  • Overview
  • WebID
  • PuSH
  • Semantic Pingback

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Introduction

OSNs: huge success these days Create a Web inside the Web Few large players = less distributed Web

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Introduction contd.

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Walled gardens

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Introduction - Situation in Web 2.0

Protocols

  • RSS
  • PubSubHubbub (PuSH)
  • Pingback
  • Webfinger, ActivityStreams, Salmon,

OStatus, ...

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Introduction - Situation in Web 2.0 contd.

Applications

  • Diaspora
  • StatusNet, DiSo, Elgg, GNU Social, The

Mine Project, Appleseed, OneSocialWeb, BuddyPress, Cliqset, Gowalla, Posterous, ... Mashups, e.g. buddycloud

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Social Networks and Semantic Web

SMOB: Microblogging sparqlPuSH

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN

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Distributed Semantic Social Network

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN - Design Principles

Linked Data Service decoupling Protocol minimalism

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN

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announce

Application Layer Profile Manager Bookmark Collection Blog Foto Sharing Service Layer Ping Push Search Update

search

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delegeate access to announce

Data Layer

Resources Feeds

Data & Media Artefacts WebIDs

index update ping

...

create update create push subscribe

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read access announce

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Activity Streams History Feeds

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN - Data Layer

Resources

  • WebIDs
  • Data artefacts (posts, comments, ...)
  • Media artefacts (images, videos, ...)

Feeds

  • Activity feeds
  • History feeds

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN - Protocol layer

WebID protocol PuSH Semantic Pingback

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN - Service Layer

Ping service Push service Search/Index service (e.g. Sindice) Update service

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

DSSN - Application Layer

Profile Manager Bookmark Collection Photo Sharing Blogs ...

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

WebID

<http://philipp.frischmuth24.de/id/me> a foaf:Person;

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foaf:name „Philipp“ ; foaf:knows <http://sebastian.tramp.name/>, <http://www.informatik.uni-leipzig.de/~auer/foaf.rdf#me>, <http://id.feedface.de/me> .

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

WebID Authentication

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[] a rsa:RSAPublicKey ; cert:identity <http://philipp.frischmuth24.de/id/me>; rsa:modulus "C41199E ... 5AB5"^^cert:hex; rsa:public_exponent "65537"^^cert:int.

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Service discovery Access delegation

Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

WebID Extensions

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pingback:to, dssn:activityFeed, dssn:historyFeed, ... <http://philipp.frischmuth24.de/id/me> dssn:deputy <http://myagent.org> .

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

PubsubHubbub (PuSH)

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Publisher

  • Provide feeds
  • Link feeds with hub
  • Notifies hub

Subscriber Hub

  • Fetches content
  • Distributes to subscribers
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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

PuSH contd.

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Bobs Feed Alice

Pull Pull Pull Pull

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

PuSH contd.

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Bobs Feed Alice

Subscribe Push

Hub

Notify

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Semantic Pingback

Extends well-known Pingback mechanism Backwards compatible (RPC) Additional: Simplified POST requests OntoWiki, Triplify, standalone server + client, AKSW service

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Alice & Bob

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Bob Alice

Bob

Pingback RPC C h e c k Comment: Alice

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Alice & Bob RDF edition

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Bob Alice

Pingback RPC or POST C h e c k New statement: alice:me foaf:knows bob:me . bob:me foaf:knows alice:me .

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Pingback client

Detects new external links (typed or untyped) Takes care of Pingback server autodiscovery Executes RPC or POST request

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Server autodiscovery

X-Pingback header field link-element with rel=“pingback“ pingback:service statement

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Pingback server

Dereferences the source of the Pingback Checks for links to target Further actions, e.g. mail or new statements:

  • untyped links: e.g. sioc:links_to
  • typed links from source to target: add

statement or inverse statement

  • other links: e.g. rdfs:seeAlso

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Creating Knowledge out of Interlinked Data

LOD2 Kick-Off . 07.09.2010 . Page http://lod2.eu

Semantic Pingback in OntoWiki

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu 28

DSSN Prototype

Based on OntoWiki application framework Employs existing functionality

  • e.g.

Versioning, WebID authentication Also new functionality (via extensions)

  • e.g. PuSH, GUI elements
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Creating Knowledge out of Interlinked Data

LOD2 Plenary Meeting . 2011-03-24 . Paris . Page http://lod2.eu 29

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Conclusions

Overcome walled gardens Reference architecture DSSN Privacy, Data security, Data ownership, Extensibility, Reliability, Freedom of communication

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Creating Knowledge out of Interlinked Data

KAIST Workshop . 2011-08-16 . Daejeon . Page http://lod2.eu

Future Work

Turn prototype into reference implemenation Finish Evaluation WebID access delegation More implemenations (e.g. re:publish)

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Creating Knowledge out of Interlinked Data

LOD2 Presentation . 02.09.2010 . Page http://lod2.eu

Thank you for your attention! Questions?