1. A geographic information system comprising: a server for providing content and hosting a description file that specifies one or more attributes of the content, including geospatial location data of the content; and a client-based module for executing a network link, the network link including a reference to a network location of the description file having one or more refresh conditions, the network link for referencing the description file to poll content and its geospatial location data from the server according to the one or more refresh conditions, and providing the polled content as a dynamic data layer showing the geospatial location data of that content.