{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://chris-page-gov.github.io/okf-explorer/profile/federation/v1/relationship-assertion.schema.json",
  "title": "OKF relationship assertion v2",
  "type": "object",
  "required": [
    "source",
    "target",
    "predicate",
    "authority",
    "derivation"
  ],
  "properties": {
    "schema": {
      "const": "okf-relationship-assertion.v2"
    },
    "id": {
      "type": "string",
      "minLength": 1
    },
    "source": {
      "type": "string",
      "minLength": 1
    },
    "target": {
      "type": "string",
      "minLength": 1
    },
    "source_iri": {
      "type": "string",
      "format": "uri"
    },
    "target_iri": {
      "type": "string",
      "format": "uri"
    },
    "predicate": {
      "type": "string",
      "minLength": 1
    },
    "kind": {
      "type": "string",
      "minLength": 1
    },
    "label": {
      "type": "string",
      "minLength": 1
    },
    "inverse_label": {
      "type": "string",
      "minLength": 1
    },
    "assertion_status": {
      "enum": [
        "official",
        "normalized",
        "inferred",
        "model-derived"
      ]
    },
    "assertion_scope": {
      "enum": [
        "real-world",
        "synthetic-fixture"
      ]
    },
    "authority": {
      "$ref": "#/$defs/authority"
    },
    "derivation": {
      "type": "string",
      "minLength": 1
    },
    "derivation_activity": {
      "type": "string",
      "minLength": 1
    },
    "rule": {
      "type": "string",
      "minLength": 1
    },
    "supporting_assertions": {
      "type": "array",
      "items": {
        "type": "string",
        "minLength": 1
      },
      "minItems": 1,
      "uniqueItems": true
    },
    "confidence": {
      "oneOf": [
        {
          "type": "number",
          "minimum": 0,
          "maximum": 1
        },
        {
          "type": "string",
          "minLength": 1
        }
      ]
    },
    "confidence_score": {
      "type": "number",
      "minimum": 0,
      "maximum": 1
    },
    "strength": {
      "type": "number"
    },
    "count": {
      "type": "integer",
      "minimum": 0
    },
    "observed_at": {
      "type": "string",
      "format": "date-time"
    },
    "stale_after": {
      "type": "string",
      "format": "date-time"
    },
    "freshness": {
      "enum": [
        "current",
        "stale",
        "unknown"
      ]
    },
    "review_status": {
      "type": "string",
      "minLength": 1
    },
    "evidence": {
      "type": "array",
      "items": {
        "oneOf": [
          {
            "$ref": "#/$defs/httpUrl"
          },
          {
            "type": "object",
            "minProperties": 1,
            "properties": {
              "url": {
                "$ref": "#/$defs/httpUrl"
              },
              "resource": {
                "$ref": "#/$defs/httpUrl"
              },
              "@id": {
                "$ref": "#/$defs/httpUrl"
              },
              "sha256": {
                "type": "string",
                "pattern": "^[0-9a-f]{64}$"
              },
              "source_sha256": {
                "type": "string",
                "pattern": "^[0-9a-f]{64}$"
              },
              "source_value_sha256": {
                "type": "string",
                "pattern": "^[0-9a-f]{64}$"
              },
              "literal_sha256": {
                "type": "string",
                "pattern": "^[0-9a-f]{64}$"
              },
              "source_artifact": {
                "type": "string",
                "minLength": 1
              },
              "source_field": {
                "type": "string",
                "minLength": 1
              },
              "field_provenance": {
                "type": "string",
                "minLength": 1
              },
              "source_value_hash_canonicalization": {
                "type": "string",
                "minLength": 1
              },
              "locator": {
                "type": "string",
                "minLength": 1
              },
              "retrieved_at": {
                "type": "string",
                "format": "date-time"
              }
            },
            "anyOf": [
              {
                "required": [
                  "url"
                ]
              },
              {
                "required": [
                  "resource"
                ]
              },
              {
                "required": [
                  "@id"
                ]
              }
            ],
            "additionalProperties": true
          }
        ]
      }
    },
    "rights": {
      "oneOf": [
        {
          "$ref": "#/$defs/httpUrl"
        },
        {
          "type": "object",
          "minProperties": 1,
          "additionalProperties": true
        }
      ]
    }
  },
  "allOf": [
    {
      "if": {
        "properties": {"assertion_scope": {"const": "synthetic-fixture"}},
        "required": ["assertion_scope"]
      },
      "then": {
        "properties": {
          "authority": {
            "properties": {"class": {"const": "synthetic"}},
            "required": ["class"]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "assertion_scope": {"const": "real-world"},
          "assertion_status": {"const": "official"}
        },
        "required": ["assertion_scope", "assertion_status"]
      },
      "then": {
        "properties": {
          "authority": {
            "properties": {"class": {"const": "official"}},
            "required": ["class"]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "assertion_scope": {"const": "real-world"},
          "assertion_status": {"enum": ["normalized", "inferred"]}
        },
        "required": ["assertion_scope", "assertion_status"]
      },
      "then": {
        "properties": {
          "authority": {
            "properties": {"class": {"const": "derived"}},
            "required": ["class"]
          }
        }
      }
    },
    {
      "if": {
        "properties": {
          "assertion_scope": {"const": "real-world"},
          "assertion_status": {"const": "model-derived"}
        },
        "required": ["assertion_scope", "assertion_status"]
      },
      "then": {
        "properties": {
          "authority": {
            "properties": {"class": {"const": "model-assisted"}},
            "required": ["class"]
          }
        }
      }
    },
    {
      "if": {
        "properties": {"assertion_status": {"const": "inferred"}},
        "required": ["assertion_status"]
      },
      "then": {
        "required": ["rule", "supporting_assertions", "confidence_score", "derivation_activity"]
      }
    },
    {
      "if": {
        "properties": {"assertion_status": {"const": "model-derived"}},
        "required": ["assertion_status"]
      },
      "then": {
        "required": ["confidence_score", "derivation_activity", "review_status"]
      }
    }
  ],
  "additionalProperties": true,
  "$defs": {
    "httpUrl": {
      "type": "string",
      "pattern": "^https?://"
    },
    "authority": {
      "type": "object",
      "required": [
        "class"
      ],
      "properties": {
        "class": {
          "enum": [
            "official",
            "derived",
            "model-assisted",
            "synthetic",
            "unclassified"
          ]
        },
        "label": {
          "type": "string",
          "minLength": 1
        },
        "source": {
          "$ref": "#/$defs/httpUrl"
        }
      },
      "additionalProperties": false
    }
  }
}