PHAIDRA@unipd, Discrete features PHAIDRA@unipd, UWmetadata data model UWmetadata structures the metadata in accordance with a hierarchy of elements de1ned in nine top-level categories, containing groups of a ributes in a tree structure Aimed to establish an inter-schema correspondence of elements, the syntax and semancs of the two schemas involved, adopng a relave translaon mode, namely trying to map each source element into at least one of the target elements, in order to avoid as much as possible any loss of informaon recorded in the source schema Es.: