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IdentityClass idDotted snake_case, starting with highway.Canonical nameParent classDefinitionClass kindLifecycle statusAbstract — a grouping type, never matched directly from a drawingAliasesAbbreviationsSearch terms

Identification contractPositive labelsNegative labelsVisual featuresMin identity clues

Evidence contractPreferred viewsCodebook: key_plan, location_plan, alignment_plan, layout, plan, longitudinal_section, profile, typical_cross_section, cross_section, pavement_detail, junction_layout, detail, schedule, pavement_layer_schedule, earthwork_schedule, culvert_schedule, setting_out_schedule, notes, specification, method_statementEvidence typesSource trace required — every value must cite a page and bbox

Measurement contractOne per line: name | symbol | unit | req or opt

Relationship contractOne per line: type -> target class idCodebook: is_a, part_of, contains, supports, supported_by, founded_on, retains, retained_by, connects, connected_to, placed_on, placed_behind, placed_around, attached_to, reinforces, restrains, protects, drains, discharges_to, locates, bounded_by, carried_by, applied_to, interacts_with, enables_construction_of, same_physical_object_as, cross_references

BOQ contractOne per line: item code | formula | result | unit

FacetsOne per line: facet name: value, value

Validation contractRule refsBlocking if missing — a missing measurement stops the BOQHuman review allowed

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