Abstract
The issue ofuser interaction for query formulation and execution has been investigated for distributed and dynamic environments, such as Peer Data Management System (PDMS). Many of these PDMS are semantic based and composed ofdata peers which exported schemas are represented by ontologies. In the literature we can find some proposed PDMS interfaces, but none ofthem addresses, in a general way, the needs of a PDMS for user interaction. In this work we propose a visual user query interface for ontology-based PDMS, which provides a simple and straightforward interaction with this type of system. It aims not only providing a natural visual query interface but also supporting precise direct manipulation ofthe data schemas for query generation.
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