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Since 2006, the Region of Sardinia (Italy) has been developing its Geographic Informa-tion System and the related Spatial Data Infrastructure, known as Sistema Informativo Territoriale Regionale- Infrastruttura dei Dati Territorial (SITR-IDT). The aim of SITR-IDT is creating and managing a spatial database and the technologic infrastructure, services and application needed for data access. This is in agreement with the princi-ples of geographic data sharing and accessibility expressed by the INSPIRE Directive; for this purpose, metadata play a fundamental role. In SITR-IDT a high importance has been given to metadata definition, acquisition and management. Proper tools for meta-data management, according to INSPIRE Implementing Rules (IR), are being devel-oped. Both INSPIRE IR and the requirements coming from an appropriate daily spatial database administration have been considered in metadata organisation. In this article, the metadata organisation adopted in SITR-IDT for data of different typologies is illus-trated. It presents the evolution of metadata organisation according to European Union Directives and technical guidelines. It also explains the switch from a quite rigid and constraining metadata schema to a more flexible and standards-compliant one. Differ-ent questions such as the metadata manager and the organisation of metadata for non-geographic data related to geographic data are discussed. The article presents a tool, the metadata manager, that should help to create, collect, and manage metadata at the appropriate levels of a Spatial Data Infrastructure.
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