On-the-fly entity-aware query processing in the presence of linkage

Ekaterini Ioannou*, Wolfgang Nejdl, Claudia Niederée, Yannis Velegrakis

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Entity linkage is central to almost every data integration and data cleaning scenario. Traditional techniques use some computed similarity among data structure to perform merges and then answer queries on the merged data. We describe a novel framework for entity linkage with uncertainty. Instead of using the linkage information to merge structures a-priori, possible linkages are stored alongside the data with their belief value. A new probabilistic query answering technique is used to take the probabilistic linkage into consideration. The framework introduces a series of novelties: (i) it performs merges at run time based not only on existing linkages but also on the given query; (ii) it allows results that may contain structures not explicitly represented in the data, but generated as a result of a reasoning on the linkages; and (iii) enables an evaluation of the query conditions that spans across linked structures, offering a functionality not currently supported by any traditional probabilistic databases. We formally define the semantics, describe an efficient implementation and report on the findings of our experimental evaluation.

Original languageEnglish
Pages (from-to)429-438
Number of pages10
JournalProceedings of the VLDB Endowment
Issue number1
Publication statusPublished - 1 Jan 2010


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