BLAST2

Abstract

We present BLAST2 , a novel technique to efficiently extract loose schema information , i.e., metadata that can serve as a surrogate of the schema alignment task within the Entity Resolution (ER) process, to identify records that refer to the same real-world entity when integrating multiple, heterogeneous, and voluminous data sources. The loose schema information is exploited for reducing the overall complexity of ER, whose naïve solution would imply O(n 2 ) comparisons, where n is the number of entity representations involved in the process and can be extracted by both structured and unstructured data sources. BLAST2 is completely unsupervised yet able to achieve almost the same precision and recall of supervised state-of-the-art schema alignment techniques when employed for Entity Resolution tasks, as shown in our experimental evaluation performed on two real-world datasets (composed of 7 and 10 data sources, respectively).