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In a Geographical Information System (GIS), queries are an essential function for extracting meaningful information from stored datasets. Two fundamental types of queries are attribute-based queries and spatial data queries. Attribute-based queries are concerned with the descriptive information linked to spatial features. For instance, a user may search for all schools with more than 500 students, or all cities with a ___ ___ _____ _____ ____ _________ ________ _________ _________ ____.
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