The combination of semantic technologies and social software has become more and more popular in the last few years as can be seen by the emergence of Semantic Wikis or the popularity of vocabularies such as FOAF or SIOC. The KiWi project is based upon these principles and o ers features required for Social Media applications such as versioning, (semantic) tagging, rich text editing, easy linking, rating and commenting, as well as advanced "smart" services such as recommendation, rule-based reasoning, information extraction, intelligent search and querying, a sophisticated social reputation system, vocabulary management, and rich visualization. KiWi can be used both, as a platform for building custom Semantic Media applications, and as a Semantic Social Index, integrating content and data from a variety of di erent sources, e.g. Wikis, blogs and content management systems in an enterprise internet. Third-party applications can access the KiWi System using simpleto-use web services. The demo presents the whole functionality of the Open Source development platform KiWi in its nal version within one integrated project management scenario. Furthermore it shows di erent KiWi-based Social Media projects to illustrate its various elds of application.
Wikis are Web-based applications which allow all users to edit content online. In
the same sense, the term "Wiki" refers to a new philosophy of working with web
content with the principles of everyone contributing, ease of use, easy linking
of information, versioning and web-based media. Semantic Wikis (e.g. Semantic
MediaWiki1 or IkeWiki2), which have been developed in the research
community in the last years [
The KIWI framework follows a service oriented architecture3 with a small core and an extension mechanism for developing application-speci c actions and program logic on top of it. The core services are usable from any extension and generic jQuery widgets communicating over RESTfull webservices and thus its functionality can easily be reused or adapted by application developers. The KiWi core involves a fully versioned triplestore, a full text and metadata search index (based on Apache SOLR4) and services to manage content, users and components.
KiWi follows the resource concept, meaning that everything such as a wiki page, person, tag, ontology class, etc. is a resource itself, a so called ContentItem. A ContentItem can be extended with RDF Relations via a facading mechanism to ful ll speci c requirements. The system uses popular ontologies such as FOAF, HGTags, IPTC Newscodes and it is possible to import self-created ontologies as well. The KiWi framework builds heavily on Java Enterprise Edition5 (Java EE 5) and JBoss Seam6 (currently version 2.1). 3
As described in [
KiWi o ers a rule-based inconsistency tolerant reasoning that can be explained
to users and that also allows for e cient knowledge base updates by the means
of reason maintenance, as described in [
http://www.kiwi-community.eu/display/DOC/KiWi+Architecture 4 Apache SOLR: http://lucene.apache.org/solr/ 5 Java Enterprise Edition:
http://www.oracle.com/technetwork/java/javaee/overview/index.html 6 JBoss Seam:http://seamframework.org/
KiWi includes two search engines, both based on a SOLR search index. The
rst one allows searching on text and RDF metadata as well as facetting on
authors, tags, types, RDF literal properties and RDF object properties.
Furthermore it is possible to personalize search. The second search engine is able to
interpret KWQL queries [
In KiWi there are several recommender services that use personal activities
to enhance content recommendations. As described in [
As described in [
Since the last demonstration at European Semantic Web Conference 2009, the project has made considerable progress, which will be presented in this demo. It shows the exploitation of the KiWi system within a project management scenario in which the system is used by a company as a Semantic Wiki to handle its project management. The Wiki is used to manage users, project pages, meetings, meeting minutes, ideas etc. The storyline followed in the demo de nes a simple work ow, i.e., how a project can be collaboratively created, structured and edited in KiWi using its enabling technologies. Furthermore it shows how existing content can versatilely be searched, integrated and displayed. To demonstrate the ability to implement di erent types of applications on top of KiWi as framework a number of other KiWi-based applications will be presented. 5
The potential of KiWi for building semantic social applications has been
demonstrated in several projects that build upon its framework. This includes the idea
management software Ideator[
Acknowledgements The research leading to these results is part of the project "KiWi - Knowledge in a Wiki" and has received funding from the European Community's Seventh Framework Programme (FP7/2007{2013) under grant agreement No. 211932. The authors would like to express their gratitude to all other KiWi developers, particularly Klara Weiand, Fred Durao, Jakub Kotowski and Marek Schmidt.