Mechanisms to Declare Scopes

The URI and RDF mechanisms described earlier (Sect. ) are specifically designed to be applied to old software systems inherited from a previous age (``legacy'' systems, though strictly speaking they should be called ``heritage'' systems). Thus so long as an existing geographic data repository is not still being updated, it can be annotated by setting up a URI which contains a subsidiary naming scheme and RDF descriptions of the metadata and schemas, and a subsidiary URI offering a unique identifier system for the individual features.