Annotations are a fundamental scholarly practice common across disciplines. They enable scholars to organize, share and exchange knowledge, and collaborate in the interpretation of source material. In this paper, we introduce the YUMA Media Annotation Framework, an ongoing open source effort to provide integrated collaborative annotation functionality for digital library portals and online multimedia collections. YUMA supports image, map, audio and video annotation and follows the OAC annotation model in order to provide data interoperability. A unique feature of YUMA is semantic enrichment, a mechanism that allows users to effortlessly augment annotations with links to contextually relevant resources on the Linked Data Web.

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