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Considering a practical scenario in the mobility domain (the integration of public transport data with open knowledge from Wikidata), participants will learn how knowledge graphs can support data harmonisation and fusion. The session combines a conceptual introduction with a guided hands-on exercise using Chimera, an open-source framework for building declarative and composable semantic data transformation pipelines. Participants will design and execute a complete data integration pipeline from ingestion of structured data to RDF lifting, SPARQL-based enrichment and construction, and RDF lowering using only YAML route definitions and declarative mapping templates. 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