{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://huggingface.co/datasets/egobowwow/universal-annotations/resolve/v1.0.0/schemas/universal-annotation-packet.schema.json",
  "title": "Universal Annotation Packet",
  "description": "Dataset-independent atomic claims with evidence, scope, epistemic status, provenance, language surfaces, and explicit availability.",
  "type": "object",
  "additionalProperties": false,
  "required": ["schema_version", "packet_id", "ontology", "source", "evidence", "nodes", "claims", "expressions", "availability"],
  "properties": {
    "schema_version": {"const": "1.0.0"},
    "packet_id": {"type": "string", "pattern": "^uap:sha256:[0-9a-f]{64}$"},
    "ontology": {
      "type": "object",
      "additionalProperties": false,
      "required": ["ontology_id", "revision_digest"],
      "properties": {
        "ontology_id": {"type": "string", "minLength": 1},
        "revision_digest": {"$ref": "#/$defs/digest"}
      }
    },
    "source": {"$ref": "#/$defs/source"},
    "evidence": {"type": "array", "items": {"$ref": "#/$defs/evidence"}},
    "nodes": {"type": "array", "minItems": 1, "items": {"$ref": "#/$defs/node"}},
    "claims": {"type": "array", "items": {"$ref": "#/$defs/claim"}},
    "expressions": {"type": "array", "items": {"$ref": "#/$defs/expression"}},
    "availability": {"type": "array", "items": {"$ref": "#/$defs/availability"}}
  },
  "$defs": {
    "id": {"type": "string", "pattern": "^[A-Za-z][A-Za-z0-9_.:-]*$", "maxLength": 192},
    "digest": {"type": "string", "pattern": "^sha256:[0-9a-f]{64}$"},
    "nullableDigest": {"oneOf": [{"type": "null"}, {"$ref": "#/$defs/digest"}]},
    "source": {
      "type": "object",
      "additionalProperties": false,
      "required": ["dataset_id", "schema_id", "record_id", "revision_digest", "native_record_digest", "license_expression"],
      "properties": {
        "dataset_id": {"$ref": "#/$defs/id"},
        "schema_id": {"$ref": "#/$defs/id"},
        "record_id": {"type": "string", "minLength": 1},
        "revision_digest": {"$ref": "#/$defs/digest"},
        "native_record_digest": {"$ref": "#/$defs/digest"},
        "license_expression": {"type": ["string", "null"]}
      }
    },
    "selector": {
      "type": "object",
      "additionalProperties": false,
      "required": ["clock_id", "start_ns", "end_ns"],
      "properties": {
        "clock_id": {"$ref": "#/$defs/id"},
        "start_ns": {"type": "integer", "minimum": 0},
        "end_ns": {"type": "integer", "minimum": 1}
      }
    },
    "evidence": {
      "type": "object",
      "additionalProperties": false,
      "required": ["evidence_id", "evidence_kind", "artifact_digest", "selector", "source_field_path"],
      "properties": {
        "evidence_id": {"$ref": "#/$defs/id"},
        "evidence_kind": {"enum": ["video", "image", "audio", "text", "sensor", "geometry", "human_judgment", "model_output", "derived_record"]},
        "artifact_digest": {"$ref": "#/$defs/nullableDigest"},
        "selector": {"oneOf": [{"type": "null"}, {"$ref": "#/$defs/selector"}]},
        "source_field_path": {"type": ["string", "null"]}
      }
    },
    "node": {
      "type": "object",
      "additionalProperties": false,
      "required": ["node_id", "node_kind", "concept_id", "attributes"],
      "properties": {
        "node_id": {"$ref": "#/$defs/id"},
        "node_kind": {"enum": ["event", "agent", "effector", "object", "location", "state", "task", "sensor", "frame"]},
        "concept_id": {"$ref": "#/$defs/id"},
        "attributes": {"type": "object"}
      }
    },
    "claimObject": {
      "oneOf": [
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["kind", "node_id"],
          "properties": {"kind": {"const": "node_ref"}, "node_id": {"$ref": "#/$defs/id"}}
        },
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["kind", "concept_id"],
          "properties": {"kind": {"const": "concept"}, "concept_id": {"$ref": "#/$defs/id"}}
        },
        {
          "type": "object",
          "additionalProperties": false,
          "required": ["kind", "value", "unit_id"],
          "properties": {
            "kind": {"const": "value"},
            "value": {},
            "unit_id": {"type": ["string", "null"]}
          }
        }
      ]
    },
    "scope": {
      "type": ["object", "null"],
      "additionalProperties": false,
      "properties": {
        "clock_id": {"type": ["string", "null"]},
        "start_ns": {"type": ["integer", "null"], "minimum": 0},
        "end_ns": {"type": ["integer", "null"], "minimum": 1},
        "coordinate_frame_id": {"type": ["string", "null"]}
      }
    },
    "epistemic": {
      "type": "object",
      "additionalProperties": false,
      "required": ["status", "confidence", "uncertainty", "visibility"],
      "properties": {
        "status": {"enum": ["observed", "measured", "human_annotated", "model_predicted", "derived", "reported"]},
        "confidence": {"type": ["number", "null"], "minimum": 0, "maximum": 1},
        "uncertainty": {"type": ["object", "null"]},
        "visibility": {"enum": ["visible", "partially_occluded", "fully_occluded", "out_of_view", "not_visual", "unknown"]}
      }
    },
    "provenance": {
      "type": "object",
      "additionalProperties": false,
      "required": ["producer_kind", "producer_digest", "method_id", "review_status", "review_receipt_digest"],
      "properties": {
        "producer_kind": {"enum": ["sensor", "human", "model", "algorithm", "mixed"]},
        "producer_digest": {"$ref": "#/$defs/digest"},
        "method_id": {"$ref": "#/$defs/id"},
        "review_status": {"enum": ["unreviewed", "single_review", "double_review", "adjudicated", "sensor_qa_pass"]},
        "review_receipt_digest": {"$ref": "#/$defs/nullableDigest"}
      }
    },
    "claim": {
      "type": "object",
      "additionalProperties": false,
      "required": ["claim_id", "subject_id", "predicate_id", "object", "scope", "evidence_ids", "epistemic", "provenance"],
      "properties": {
        "claim_id": {"$ref": "#/$defs/id"},
        "subject_id": {"$ref": "#/$defs/id"},
        "predicate_id": {"$ref": "#/$defs/id"},
        "object": {"$ref": "#/$defs/claimObject"},
        "scope": {"$ref": "#/$defs/scope"},
        "evidence_ids": {"type": "array", "minItems": 1, "uniqueItems": true, "items": {"$ref": "#/$defs/id"}},
        "epistemic": {"$ref": "#/$defs/epistemic"},
        "provenance": {"$ref": "#/$defs/provenance"}
      }
    },
    "expression": {
      "type": "object",
      "additionalProperties": false,
      "required": ["expression_id", "locale", "text", "speech_act", "claim_ids", "method", "review_status", "review_receipt_digest"],
      "properties": {
        "expression_id": {"$ref": "#/$defs/id"},
        "locale": {"type": "string", "minLength": 2},
        "text": {"type": "string", "minLength": 1},
        "speech_act": {"enum": ["observation", "directive", "question", "answer", "warning", "feedback", "unknown"]},
        "claim_ids": {"type": "array", "minItems": 1, "uniqueItems": true, "items": {"$ref": "#/$defs/id"}},
        "method": {"enum": ["source", "human_translation", "algorithmic_projection", "model_candidate"]},
        "review_status": {"enum": ["source_verified", "pending", "single_review", "bilingual_adjudicated"]},
        "review_receipt_digest": {"$ref": "#/$defs/nullableDigest"}
      }
    },
    "availability": {
      "type": "object",
      "additionalProperties": false,
      "required": ["dimension_id", "status", "reason"],
      "properties": {
        "dimension_id": {"$ref": "#/$defs/id"},
        "status": {"enum": ["present", "not_collected", "not_applicable", "unknown"]},
        "reason": {"type": "string", "minLength": 1}
      }
    }
  }
}