Fundamental concepts for interactive paper and cross-media information spaces
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While there have been dramatic increases in the use of digital technologies for information storage, processing and delivery over the last twenty years, the affordances of paper have ensured its retention as a key information medium. Despite predictions of the paperless office, paper is ever more present in our daily work as reflected by the continuously increasing worldwide paper consumption. Many researchers have argued for the retention of paper as an information resource and its integration into cross-media environments as opposed to its replacement. This has resulted in a wide variety of projects and technological developments for digitally augmented paper documents over the past decade. However, the majority of the realised projects focus on technical advances in terms of hardware but pay less attention to the very fundamental information integration and cross-media information management issues. Our information-centric approach for a tight integration of paper and digital information is based on extending an object-oriented database management system with functionality for cross-media information management. The resulting iServer platform introduces fundamental link concepts at an abstract level. The iServer’s core link management functionality is available across different multimedia resources. Only the media-specific portion of these general concepts, for example the specification of a link’s source anchor, has to be implemented in the form of a plug-in to support new resource types. This resource plug-in mechanism results in a flexible and extensible system where new types of digital as well as physical resources can easily be integrated and, more importantly, cross-linked to the growing set of supported multimedia resources. In addition to the associative linking of information, our solution allows for the integration of semantic metadata and supports multiple classification of information units. iServer can, not only link between various static information entities, but also link to active content and this has proven to be very effective in enabling more complex interaction design.