The application contains a list of existing subjects (The Register of the NSDI Subjects) and sources (The Register of the Spatial Data Sources) and enables the entry of changes and new subjects or sources. The registers are interconnected in such a way that The Register of the Subjects provides an overview of all the sources reported by a given subject. By clicking on a link, it is possible to access each source, which is described in detail in The Register of the Spatial Data Sources.
In addition, templates for entry into both registers (The Register of the Subjects and The Register of the Spatial Data Sources) are available, allowing for simple registration of new subjects and sources.