Core Metadata [Schema] for Learner Corpora Draft 1.0

First proposal towards a "Core Metadata [Schema] for Learner Corpora", presented at the "CLARIN workshop on Interoperability of Second Language Resources and Tools", Gothenburg, Sweden, 06-08/12/2017 <https://sweclarin.se/swe/workshop-interoperability-l2-resources-and-tools>. It was circulated as part of the invited talk "Towards standardization of metadata for L2 corpora" that took stock of a range of metadata sets and made suggestions for minimal and maximal design principles, but it was never published (or part of a publication).