018

blvh:slot:018

sampling_operation; slot=018; candidate_set=historical; subgroup=africa; target_period=1870-1899; query_pool=Africa; African village; African city; expedition Africa; colonial Africa; mask_rule=record; do not use as truth criterion; book_cap=max 2 selected images per book; selection_method=SigLIP2 semantic retrieval + diversity review; required_provenance=fname, record_id, query_text, rank, similarity, model, image_type, date_raw; status=TO_SELECT; sampling_version=blvh-0.2. observation_status=machine_selection_plan; NEVER promote the semantic query to a factual subject label.