This interface allows the user to provide a custom URL for each image or chart. It is only used
when exporting to HTML or DHTML and dynamic export is set to true. The likely scenario is that
the export is being streamed to an output stream rather than being written to a file. Classes
implementing this interface will define the 'generateImageURL' method which takes an image in the
form of a byte array and returns an URL where the image can be accessed. It is responsibility of
the implementing class to store this byte array and make it available via an URL connection.
Please see the RPTImageGenerator servlet (quickstart guide 1.5.7.11.1) for an example.