The ISLE Meta Data Initiative (IMDI) is a metadata standard to describe multi-media and multi-modal language resources. The standard provides interoperability for browsable and searchable corpus structures and resource descriptions. The full specifications can be found in the documents below.
Note that TLA no longer uses IMDI metadata for the archive, but a selected number of CMDI metadata profiles instead, see https://archive.mpi.nl/tla/accepted-metadata
Documentation about IMDI metadata: