
Due to its flexibility and extensive tool support, XML is an obvious choice for a generic data exchange format. However, the verbosity and processing overhead of textual XML impedes its use in resource-restricted embedded networks. These disadvantages have been addressed by the introduction of binary representations of the XML Infoset such as W3C’s Efficient XML Interchange (EXI) format. EXI can be used to significantly reduce message size and processing overhead for XML-based messaging. In this paper, we show how to leverage EXI for filter-enabled binary XML dissemination in embedded networks. The approach further reduces resource consumption by sharing common data and processing results among a set of multiple queries. Thus, through the suitable placement of pre- and post-filters on binary XML data, bandwidth on network connections and computational resources on nodes can be saved. Consequently, more data can be processed with a certain amount of available resources within an embedded network.
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