{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://content-explorer.local/schemas/snapshot-0.1.json",
  "title": "Content Explorer snapshot v0.1",
  "type": "object",
  "additionalProperties": false,
  "required": ["schemaVersion", "dataspace", "kinds", "entities", "relations", "sources", "claims"],
  "properties": {
    "schemaVersion": {"const": "0.1"},
    "dataspace": {
      "type": "object",
      "additionalProperties": false,
      "required": ["id", "title", "description"],
      "properties": {
        "id": {"type": "string", "pattern": "^[a-z0-9-]+$"},
        "title": {"type": "string", "minLength": 1},
        "description": {"type": "string", "minLength": 1}
      }
    },
    "kinds": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "label", "plural"],
        "properties": {
          "id": {"type": "string", "pattern": "^[a-z0-9-]+$"},
          "label": {"type": "string"},
          "plural": {"type": "string"}
        }
      }
    },
    "entities": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "kindId", "title", "tldr", "summary", "sourceRefs"],
        "properties": {
          "id": {"type": "string", "pattern": "^urn:ce:[a-z0-9-]+:[a-z0-9-]+:[a-z0-9-]+$"},
          "kindId": {"type": "string"},
          "title": {"type": "string"},
          "tldr": {"type": "string"},
          "summary": {"type": "string"},
          "aliases": {"type": "array", "items": {"type": "string"}},
          "tags": {"type": "array", "items": {"type": "string"}},
          "properties": {"type": "object"},
          "sourceRefs": {"type": "array", "items": {"type": "string"}},
          "claimRefs": {"type": "array", "items": {"type": "string"}},
          "asOf": {"type": "string", "format": "date"},
          "state": {
            "enum": ["present", "missing", "unknown", "redacted", "stale", "contradicted", "not-applicable"]
          }
        }
      }
    },
    "relations": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "predicate", "from", "to", "sourceRefs"],
        "properties": {
          "id": {"type": "string"},
          "predicate": {"type": "string", "pattern": "^[a-z0-9-]+$"},
          "from": {"type": "string"},
          "to": {"type": "string"},
          "sourceRefs": {"type": "array", "items": {"type": "string"}, "minItems": 1},
          "asOf": {"type": "string", "format": "date"}
        }
      }
    },
    "sources": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "uri", "title", "license"],
        "properties": {
          "id": {"type": "string"},
          "uri": {"type": "string"},
          "title": {"type": "string"},
          "license": {"type": "string"},
          "attribution": {"type": "string"},
          "licenseUrl": {"type": "string"},
          "originSha": {"type": "string"},
          "modificationNotice": {"type": "string"},
          "retrievedAt": {"type": "string", "format": "date"}
        }
      }
    },
    "claims": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["id", "subjectId", "key", "status", "evidenceRefs"],
        "properties": {
          "id": {"type": "string"},
          "subjectId": {"type": "string"},
          "key": {"type": "string"},
          "value": {},
          "status": {"enum": ["asserted", "unknown", "contested", "withheld"]},
          "preferred": {"type": "boolean"},
          "evidenceRefs": {"type": "array", "items": {"type": "string"}, "minItems": 1},
          "observedAt": {"type": "string", "format": "date"}
        }
      }
    }
  }
}