The Metadata and Semantics WG organises the last workshop before the NI4OS-Europe project completes its contractual obligations. The event will take place online on Tuesday 15th February at 09.00 CET. The focus is on practical application of ontologies and semantics for data management with presentations spanning from detailing ontologies and standard for the description and the integration of research data, to informing about available frameworks for semantic knowledge integration, as well as techniques for mapping and transforming data for integrations.