This namespace is specified in ST 2067-2:2016 - SMPTE Standard - Interoperable Master Format — Core Constraints.
The following elements are defined in the namespace:
[[{"fid":"34","view_mode":"default","fields":{"format":"default"},"type":"media","link_text":"st2067-2a-2016.xsd","attributes":{"class":"file media-element file-default"}}]]