Semantic Overlay Networks
Semantic overlays; SONs
Semantic Overlay Networks are types of Overlay Networks where the topology is formed according to the resources (i.e., services or data provided) of the participants. This is done on the basis of similarity between participants, which is calculated by means of resource metadata exchange (e.g. keywords, term vectors, concepts from ontologies, histograms).
Semantic Overlay Networks were introduced in 2002, by H. Garcia-Molina and A. Crespo . The motivation was to give an alternative to inefficient search methods for overlay networks, one that would provide more relevant results in less time and using less resources (mainly bandwidth).
The original idea of Semantic Overlay Networks  was to organize the nodes that participate in a network into many different overlays, based on the content that the nodes are contributing and some classification scheme for this content. As one overlay is created for each...
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