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 A propositionalization filter inspired by the RELAGGS algorithm.<br/>
 It processes all relational attributes that fall into the user defined range (all others are skipped, i.e., not added to the output). Currently, the filter only processes one level of nesting.<br/>
 The class attribute is not touched.<br/>
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 For more information see:<br/>
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 M.-A. Krogel, S. Wrobel: Facets of Aggregation Approaches to Propositionalization. In: Work-in-Progress Track at the Thirteenth International