= About Skipforward =
Skipforward is a distributed recommendation system using a lightweight ontology approach for formalizing opinions about item features.
Items can be things such as songs or board games; example item features are the genre of a song or the degree of chance in a board game.
Every user of the system is free to add new items and statements about existing items to the system.
Naturally, opinions may differ between users---the system even encourages people to express dissent by supporting negation for item features.
Skipforward allows discussions for any item feature as well as displaying these discussions in a way similar to web forums.

Skipforward uses the [http://www.gnu.org/licenses/agpl-3.0.html GNU Affero General Public License] version 3.

= Features =
 * supports '''ontology-based subjective personalized annotations''' using the ''Skipinions'' ontology
 * implements '''personalized views''' using weighted aggregation of multiple statements concerning one item and feature type
   * competence metric works per feature type and is based on modified Pearson correlation
 * '''recommender functionality''' for...
   * similar items (based on their annotations)
   * items matching a predefined annotation profile
   * item annotations (recommending feature types highly relevant for the item recommender but not yet present for the current item)
   * experts (users with high correlation concerning one feature type)
 * '''explanations''' available for recommendations
 * personalized '''RSS newsfeeds'''
 * all information available as '''Linked Open Data''', too
 * '''distributed design''' based on full replication using [http://xmpp.org/ XMPP]
 * integrated with '''[wiki:DBTropes DBTropes]'''

= Starting Points =
 * '''[http://skipforward.net/skipforward/ Demo installation]''' - "Login as demo user" logs you in read-only.
   * GettingStarted - how to log in and set up the system using an own XMPP account.
 * Screencasts
   * '''[wiki:UseCaseInterzone Interzone use case]''' - based on revision 573 (2011-09-26)
     * This illustrates short story annotation and search.
   * [https://skipforward.opendfki.de/repos/trunk/web/video/index.html (Old) screencast] - based on revision 224 (2008-10-26).
     * Features not demonstrated here: Trust network and opinion/user similarity metrics, alternative user interface, RSS feeds, improved search.

= Development =
 * [source:trunk/skipforward Browse source]
 * SVN repository is available at https://skipforward.opendfki.de/repos/trunk/
 * [wiki:Ideas Ideas] collection
 * [wiki:DocumentationForDevelopers Developer documentation]

= Contact =
 * [http://www.dfki.de/~kiesel/ Malte Kiesel]

= Publications =
 * Malte Kiesel, Florian Mittag. ''Personalization in Skipforward, an Ontology-Based Distributed Annotation System''. [http://www.dai-labor.de/spim2011/ SPIM] workshop, [http://iswc2011.semanticweb.org/ ISWC 2011]. [http://www.dfki.uni-kl.de/~kiesel/paper/2011_Skipforward_ISWC_SPIM.pdf Paper].
 * Malte Kiesel, Sven Schwarz. ''Skipforward---a Lightweight Ontology-Based Peer-To-Peer Recommendation System''. [http://iswc2008.semanticweb.org/ ISWC 2008] Demonstration. [http://ftp.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-401 CEUR-WS Volume 401]. [http://www.dfki.de/~kiesel/paper/2008_Skipforward_ISWC_Poster.pdf Poster].