This version aligns with the STIX 2.1 CS 03 (WD12) document, also known as the "OASIS Standard".
Main Changes
#509 Add Sighting.summary default value
#503 Revamp how STIX content customization is detected and enforced enhancement
#500 fp write for STIX Objects
#492 Drop 'six' dependency (backwards breaking)
#490 Change canonicalization to normalization
#489 Fix observation expression DNF transformer to preserve FOLLOWEDBY order.
#485 Update CustomObservable decorator
#483 add is_sdo() et al functions
#481 Refactor stix2.parsing into more focused modules
#480 Support Pagination in TAXII DataStore
#476 FileSystemsSink.add creates an additional level of directory hierarchy
#458 Versioning refinements
#468 Extensions Support
Changes for CS03
#517 Update links in code to current specification
#515 Add new infrastructure-type-ov entries
#514 Update Network Traffic for CS03
#504 Fix sighting.last_seen check
Semantic Similarity
#499 Update incident weights for semantic similarity
#496 Similarity/Equivalence Changes
#493 Update the semantic equivalence user guide page
#491 Graph Equivalence Changes
Testing, etc
#482 Migrate test to GitHub Actions, update test & check configuration