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There is a growing need for GIS, decision support, and location intelligence applications. Maps can be more than just static and read only artifacts. Rather, they can be fully integrated within an application to allow users to interact directly with their data. Furthermore, user interfaces can be created that abstract the complexity of GIS and provide non-GIS professionals with a user interface metaphor for their business domain. Open source GIS software tools, such as OpenLayers, GeoServer, and PostGIS, are incredibly powerful and are often viable alternatives to commercial GIS tools. However, building an enterprise-class geospatial application using these tools is a daunting task. We will demonstrate how to quickly integrate open source GIS tools with an open source data management framework to build GIS and decision support applications. By using ontologies to model geographical locations, called geo-ontologies, we will demonstrate how to build location intelligence applications.