The PR updates the security playbook object with improved semantics based on feedback we have received.
The updated template has "one-to-one" mapping with the available STIX 2.1 ad-hoc extension for the COA SDO available here: https://github.com/fovea-research/stix2.1-coa-playbook-extension
This research (updated version 3) was partially supported by the research projects CyberHunt (Grant No. 303585 - funded by the Research Council of Norway) and JCOP (Grant No. INEA/CEF/ICT/A2020/2373266 - funded by the European Health and Digital Executive Agency through the Connected Europe Facility program).