Titlebook: Handbuch der Mathematikdidaktik; Regina Bruder,Lisa Hefendehl-Hebeker,Hans-Georg We Book 20151st edition Springer Berlin Heidelberg 2015 D

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large volumes of data at the absence of an explicit data schema. On the other hand, schema information is sometimes essential for applications during data retrieval. Consequently, there are approaches to schema construction in the JSON community. We will suppose JSON collections equipped by a schem

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because of data fluctuation in subsequent versions. In this paper there is presented a multi-version data model capable of preserving full version history. Such a model allows updates not ordered chronologically. It is obtained by using semantics received from applications. The version of data item

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Lisa Hefendehl-Hebeker,Inge SchwankL tools and other specialized software. While much attention has been paid to architecture, query languages, and query execution, the final step of actually fusing data from multiple sources into a consistent and homogeneous set is often ignored..This paper states the formal problem of data fusion i

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Lisa Hefendehl-Hebeker,Sebastian Rezatformance, in this paper we propose an extension of the M-tree family, which makes use of nearest-neighbor (NN) graphs. Each tree node maintains its own NN-graph, a structure that stores for each node entry a reference (and distance) to its nearest neighbor, considering just entries of the node. The

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