This namespace is specified in:
ST 2067-2:2020 (Interoperable Master Format — Core Constraints).
The following elements are defined in the namespace:
[[{"fid":"65","view_mode":"default","fields":{"format":"default"},"link_text":"st2067-2a-2020.xsd","type":"media","field_deltas":{"1":{"format":"default"}},"attributes":{"class":"media-element file-default","data-delta":"1"}}]]