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- 219 creator patrik-schneider.
- 219 creator thomas-eiter.
- 219 creator thomas-krennwallner.
- 219 type InProceedings.
- 219 label "Lightweight Spatial Conjunctive Query Answering using Keywords".
- 219 sameAs 219.
- 219 abstract "With the advent of publicly available geospatial data, ontology-based data access (OBDA) over spatial data has gained increasing interest. Spatio-relational DBMSs are used to implement geographic information systems (GIS) and are fit to manage large amounts of data and geographic objects such as points, lines, polygons, etc. In this paper, we extend the Description Logic DL-Lite with spatial objects and show how to answer spatial conjunctive queries (SCQs) over ontologies---that is, conjunctive queries with point-set topological relations such as next and within---expressed in this language. The goal of this extension is to enable an off-the-shelf use of spatio-relational DBMSs to answer SCQs using rewriting techniques, where data sources and geographic objects are stored in a database and spatial conjunctive queries are rewritten to SQL statements with spatial functions. Furthermore, we consider keyword-based querying over spatial OBDA data sources; as ordinary web users are not familiar with formal query languages and the less with SCQ, this is a reasonable and common way to express a search intention. We show how to map queries expressed as simple lists of keywords that describe objects of interest to SCQs, using a meta-model for completing the SCQs with spatial aspects. We have implemented our lightweight approach to spatial OBDA in a prototype and show initial experimental results using data sources such as Open Street Maps and Open Government Data Vienna from an associated project. We show that for real-world scenarios, practical queries are expressible under meta-model completion, and that query answering is computationally feasible.".
- 219 hasAuthorList authorList.
- 219 isPartOf proceedings.
- 219 keyword "Keyword-based Query Answering".
- 219 keyword "Lightweight reasoning".
- 219 keyword "Ontology-Based Data Access".
- 219 keyword "Spatial Query Answering".
- 219 title "Lightweight Spatial Conjunctive Query Answering using Keywords".