As Topic Maps allow a structural representation of knowledge, this structure often needs to be visually presented to end-users. Issues, often contradictory, such as representation and navigation re-

In this contribution, we address exploratory search where a user is faced with an information need concerning a domain he lacks specific knowledge. Based on the work of Delbru et al., which introduced metrics to measure the navigational quality of automatically selected facets for RDF data, we apply those findings to the semantically richer TMDM and show how exploratory search functionality can...

Any functor from the category of C*-algebras to the category of locales which assigns to each commutative C*-algebra its Gelfand spectrum must be trivial on algebras of n-by-n matrices for n ≥ 3. The same obstruction applies to the Zariski, Stone, and Pierce spectra. The possibility of spectra in categories other than that of locales is briefly discussed. A recent article [7] by Reyes shows tha...

We outline the main elements of what we call polyscopic structuring of information and argue that information needs to be structured accordingly. The principles of polyscopy may both serve as guidelines for creating Topic Maps, and provide orientation for further development of Topic Maps standards and software.

vi CHAPTER 1. OVERVIEW 1

Topic Maps are means for representing sophisticated, conceptual indexes of any information collection for the purpose of semantic information integration. To properly fulfil this purpose, the generation of Topic Maps has to base on a solid theory. This paper proposes the Observation Principle as the theoretical fundament of a future scientific discipline Topic Maps Engineering. SemanticTalk gen...

In dieser Untersuchung werden die drei Lokalen Suchmaschinen Google Maps, Bing Maps und TOnline Maps in einem kombinierten Eye-Trackingund Usability-Test verglichen. Es zeigen sich sowohl Probleme bei der Benutzung einzelner Suchmaschinen als auch übergreifende Ergebnisse, die für die Gestaltung von kartenbasierten Suchmaschinen relevant sind. Wir geben Empfehlungen für die Gestaltung solcher S...

This work presents rst steps towards a denotational semantics for relational databases. It is argued that such a semantics will increase the chances of successfully incorporating relational databases into typed programming languages. Database relations are seen as sets of data of a common structure. The main problem therefore is to model a type of sets. We propose the snack powerdomain for this...