Remarks
CTS certified until 2022. Starting in 2026, Phaidra adopts a bibliographic metadata schema modelled in RDF (Resource Description Framework) according to Linked Data principles, ensuring unique identification of resources, explicit semantic relationships, and interoperability with other data graphs on the Web. Metadata is expressed in JSON-LD, a standard RDF serialisation that favours integration with web applications and data exchange. Many fields use descriptors from controlled vocabularies, mostly available in the Phaidra Vocabulary Server (https://vocab.phaidra.org/).
For an overview of metadata fields, you can consult the Metadata fields overview page (https://phaidra.unipd.it/metadata-fields-help).
Digital objects uploaded before 2026 remain described according to the previously adopted data model Universität Wien metadata - UWmetadata (https://phaidra.unipd.it/static/phaidra-uwmetadata.pdf), resulting from the expansion of the Learning Object Metadata standard, LOM (1484.12.1-2002 IEEE Standard for Learning Object Metadata) and the fusion combination of categories and elements derived or customised from different metadata schemas, and as such can be placed among the examples of LOM application profiles.