A pictorial query language for querying geographic databases using positional and OLAP operators

E Pourabbas, M Rafanelli - ACM SIGMOD Record, 2002 - dl.acm.org
E Pourabbas, M Rafanelli
ACM SIGMOD Record, 2002dl.acm.org
The authors propose a declarative Pictorial Query Language (called PQL) that is able to
express queries on an Object-Oriented geographic database drawing the features which
form the query. These features refer to the classic ones of a geographic environment (geo-
null, geo-points, geo-polyline, and geo-region) and define the alphabet of the above
mentioned language. This language, extended with respect to a previous one, considers
twelve positional operators and a set of their specifications. Moreover, the possibility to use …
The authors propose a declarative Pictorial Query Language (called PQL) that is able to express queries on an Object-Oriented geographic database drawing the features which form the query. These features refer to the classic ones of a geographic environment (geo-null, geo-points, geo-polyline, and geo-region) and define the alphabet of the above mentioned language. This language, extended with respect to a previous one, considers twelve positional operators and a set of their specifications. Moreover, the possibility to use the mentioned language to query multidimensional databases is discussed. Finally, the characteristic of the mentioned language by a query example is shown.
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