https://henrivandewaalfoundation.org/iconclassprospectus.pdf
"The Rijksmuseum, the Bildindex, the Deutsche Digitale Bibliothek, Europeana: at many levels of aggregation images tagged with Iconclass concepts, are published in Open Access. Many other libraries and museums also make their data sources available without restrictions, often indexed with their own vocabulary systems. Both types of resources are eligible for batch import in the Illustrated Iconclass, either with their own ready-made encoding, or after their proprietary vocabularies are brought in synch with Iconclass terminology"









