Refactor schema slots and classes
- Deleted obsolete slot definitions: statement_summary, statement_text, statement_type, status_name, supersede_articles, supersede_condition, supersede_name, temporal_dynamics, total_amount, typical_contents, use_cases, was_acquired_through, was_fetched_at, was_retrieved_at.
- Updated existing slot definitions for states_or_stated to enhance clarity and structure.
- Introduced new classes: Article, ConditionofAccess, FinancialStatementType, MaximumQuantity, Series, Summary, Type, and their respective slots to improve schema organization and usability.
- Added new slots: changes_or_changed_through, has_or_had_condition_of_access, has_or_had_heritage_type, is_or_was_part_of_series, is_or_was_retrieved_at, maximum_of_maximum to capture additional metadata and relationships.
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