In this paper we present the PRiSMHA project, whose main goal is to demonstrate that a rich semantic representation of the content of historical documents is useful -since it can significantly improve the access to archival resources -and sustainable -thanks to a crowdsourcing approach. This goal poses interesting research challenges, both for the semantic model definition and the user interaction. Such challenges range from the dialog between computer scientists and historians, to the design

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... an effective ontology-driven user interface; from the strategies to ensure the quality of the semantic metadata produced, to the application of Information Extraction techniques to support user annotation.