Resource annotation framework in a georeferenced and geospatial digital library

In this paper, we present a resource annotation framework for georeferenced and geospatial digital libraries and discuss its application in G-Portal. The framework is flexible for managing annotations of heterogeneous web resources. It allows users to contribute not only the annotation content but also the schema of the annotations. Meanwhile, other digital library services, such as visualization and classication, can be provided over the annotations since they are treated as first class objects. This paper mainly focuses on the design of the resource annotation framework.Accepted versio