- Introduced BirthDate class with support for EDTF notation, provenance tracking, and confidence scoring.
- Added BirthPlace class to preserve historical names, link modern equivalents, and integrate geographic identifiers.
- Created Approximation Level slot to express uncertainty levels for various values.
- Migrated existing slots to structured classes for better data modeling, including has_or_had_date_of_birth and has_or_had_place_of_birth.
- Enhanced service area representation with has_or_had_service_area slot, linking to ServiceArea class.
- Updated is_or_was_approximate slot to model uncertainty levels using ApproximationStatus class.
- Archived previous versions of slots for historical reference.
