Peter Wullinger

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At least two types of ageing processes affect digital records: media ageing and semantic ageing. We argue that the main challenges for digital preservation arise from semantic ageing, that is, the evolution of data formats. The article analyzes a type of document that is particularly vulnerable to semantic ageing: the digital maps produced by researchers on(More)
A recent evaluation of the complexity of temporal planning by Cushing et al. [1] unveiled the interesting result that many current temporal planning problems may be transformed into classical ones in linear time; in other words, they are actually not temporal. Based on this insight, we introduce a new, graded classification of classical planning problems(More)
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