{"L1_core": {"type": "temporal_marker", "domain": "specification", "category": "year"}, "L3_technical": {"year": 2028, "industry_context": ["efficiency_evolution", "market_projection", "legacy_phaseout"]}, "L2_specification": {"type": "year", "value": 2028, "context": ["long_term_planning", "roadmap", "future_regulation"], "purpose": "product_timeline"}}