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Data Model Overview
The core of the data model of the URR consists of seven relations that describe the users, applications, requirements, and various needs related to decision making and support through Earth observations (middle part in the diagram). A link relation is used to capture the interconnectivity between entries in each of these relations (top part). In addition, two additional registries represent a lexicon of all terms used and the references to documents that provide additional informations on the entries in the various relations (lower part).
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