OntoWiki: a Semantic Data Wiki Enabling the Collaborative Creation and (Linked Data) Publication of RDF Knowledge Bases

In our demonstration (with supportive poster) we want to present the Semantic Wiki application OntoWiki, which is an extensible tool for managing structured information in a collaborative, web-based environment. OntoWiki provides sophisticated means for navigating, visualising and authoring of RDF-based Knowledge Bases. It serves and consumes Linked Data and comprises a comprehensive middleware API for building custom Semantic Web applications. We refer to it as a Wiki, since our focus is on simplicity, adaptability and collaboration. However, other than annotating text-based Wiki pages with a special syntax (as suggested by text-based Semantic Wiki approaches), OntoWiki uses RDF in the first place to represent information. For human users, OntoWiki allows to create different views on data, such as tabular representations or maps. For machine consumption it supports various RDF serialisations as well as RDFa, Linked Data and SPARQL interfaces. Since its introduction [1], the application has evolved into a framework for building Semantic Web applications [2] and was recently updated to support the collaboration across multiple domains and application via Semantic Pingback [3] and RDFauthor [5]. 1. DEMONSTRATION CONTENT OntoWiki can be used to author, manage and publish RDF-based knowledge bases. In particular, our demonstration will focus on the following topics. We have highlighted several phrases and keywords to give the reader a better overview on the main demonstration points. Navigation and Visualisation OntoWiki provides a number of ways for navigating through RDF knowledge bases. These include taxonomy and hierarchy browsing (e.g. via SKOS taxonomies or the class hierarchy), facet-based browsing (with complex filter conditions and attribute based tag clouds) and fullThe feature list is far away from being complete, so please refer http://ontowiki.net (for end-user centred functionality and screen-casts) and http://code.google.com/p/ ontowiki/ (for administration features and extensibility as well as development information) for a more complete view on our application. text search. These different navigation facilities can also be used as a combined navigation, for example a user can start with a full-text search and refine the results using faceted-search or restrict them to a certain part of the selected hierarchy. OntoWiki translates these different navigation features into a single SPARQL query. In addition to rendering the results of such a query as a resource list, OntoWiki provides an extension mechanism for implementing dedicated views like maps and calendars. Once a specific entity has been selected, the resource view displays all available information for that entity. Besides rendering this information generically in a tabular way, OntoWiki can be extended with domain specific resource views (i.e. vocabulary). Specific resource views for the SKOS and FOAF vocabularies are already included. Figure 1 shows the domain-independent list and resource view of OntoWiki.