XML Schema Complete Reference, The

21.7. Example Application

With the concept of a distributed XML application in mind, we can create an example application that uses XML to communicate between a client and server. This example provides a sim-ple XML application for testing the position of a given point in relation to a potentially bounding polygon. Given point A, defined by two coordinates, and polygon B, defined by a list of points that indicate vertices, the application determines whether point A lies inside polygon B. Figure 21.5 shows the concept—one that comes up often in computer graphics but that also has applications in other areas. For example, in location-based services, the same algorithms can be used to determine if a GPS-enabled device has entered a particular region ...