This version aligns with the STIX 2.1 CS 03 (WD12) document, also know 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