Spontaneous Collaboration via Browsing of Semantic Data on Mobile Devices.

In this paper we present a tool for browsing "semantically connected" data that the user has collected (or subscribed to) from multiple sources. By allowing customized views of the data, our tool can be seen as an application platform for data-oriented applications. The view of the data can be customized based on the data itself (e.g., it can depend on specific datatypes); additionally, it can also vary based on the user's current "context" as well as any enforced policies (access, privacy, etc.). Our tool can be used to form spontaneous collaborations between mobile devices and their users by providing a personalized and localized view of the integrated semantic data from multiple users. Browsing semantic data on a mobile device also adds interesting dimensions to the scenario: A mobile device has a wealth of information about its user, and it also has data available for determining the user's context. The dynamic nature of mobile environments presents certain challenges as other devices can appear or disappear without forewarning. The physical proximity of local services and actors will also offer opportunities for, say, new ways of establishing trust between systems. We present some usage scenarios that make use of our system and the representation formalism (RDF++, an extension of RDF) that it employs.