In its participation at GeoCLEF 2006, the University of Hildesheim focused on the monolingual German and English and the bilingual German ←→ English tasks. Based on the results of GeoCLEF 2005, the weighting of and the expansion with geographic named entities (NE) within a Boolean retrieval approach was examined. Because the best results 2005 were achieved with Blind Relevance Feedback (BRF) in which NEs seemed to play a crucial role, the effects of adding particular geographic NEs within the BRF are explored. The paper presents a description of the system design, the submitted runs and results. A first analysis of unofficial post experiments indicates that geographic NEs can improve BRF and supports prior findings that the geographical expansion within a Boolean retrieval approach does not necessarily lead to better results - as it is often assumed.
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