RWTH Aachen University
Dynamic environments are decentralized systems that provide users with querying capabilities over a set of heterogeneous, distributed and autonomous data sources. Data integration systems, Peer Data Management Systems (PDMSs) and dataspaces are examples of such systems. They are composed by data sources (peers) that belong to a specific domain and are linked to each other by mappings (correspondences). Nonetheless, a challenge inherent to dynamic environments is to analyze the semantic loss during query reformulation. A semantic loss may occur when a query is reformulated from a peer to another in the system.