Learning objects and content interchange standards provide new possibilities for e-learning. Nevertheless the content often lacks context data to find appropriate use for adaptive learning on demand and personalized learning experiences. In the Remotely Accessible Field Trips (RAFT) project mobile authoring of learning content in context has shown the relevancy of contextual metadata for flexible access to learning objects. This article describes approaches for extending current metadata schemas with context metadata that can be captured together with the assets on the fly, giving them a learning context. (Contains 5 figures.)