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The increasing complexity of spatio-temporal applications has caused the underlying queries to be more sophisticated and usually carry complex semantics. As a result, the traditional spatio-temporal query types, e.g., range, kNN, and aggregation queries, have become just building blocks in more complex query plans. In this paper, we present the STEPQ system, which is an extensible spatio-temporal query engine for complex pattern processing over spatio-temporal data. STEPQ enables full-fledgeddoi:10.5220/0004992401570169 dblp:conf/data/ZhengDTE14 fatcat:xvjadll4wvdn5au3jjr5luid5y