Description
CS03:
STIX Version 2.1
Committee Specification 03
21 May 2021
https://docs.oasis-open.org/cti/stix/v2.1/cs03/stix-v2.1-cs03.docx
https://docs.oasis-open.org/cti/stix/v2.1/cs03/stix-v2.1-cs03.html
https://docs.oasis-open.org/cti/stix/v2.1/cs03/stix-v2.1-cs03.pdf