{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://logicsrc.com/schemas/openontology/constraint.schema.json",
  "title": "LogicSRC OpenOntology Constraint",
  "description": "A deterministic validation rule over the knowledge layer. Constraints never require an LLM to decide conformance.",
  "type": "object",
  "required": ["openontology", "kind", "id", "description", "rule"],
  "additionalProperties": false,
  "properties": {
    "openontology": { "type": "string", "pattern": "^\\d+\\.\\d+(\\.\\d+)?$" },
    "kind": { "const": "Constraint" },
    "id": { "type": "string", "minLength": 1 },
    "description": { "type": "string", "minLength": 1 },
    "severity": {
      "type": "string",
      "enum": ["error", "warning", "info", "policy"],
      "default": "error"
    },
    "code": {
      "type": "string",
      "description": "Stable machine-readable code reported on violation, e.g. 'OO-C-REQUIRED-PREDICATE'."
    },
    "remediation": { "type": "string", "description": "Hint shown with the violation." },
    "rule": { "$ref": "#/$defs/rule" },
    "extensions": { "type": "object" }
  },
  "$defs": {
    "rule": {
      "type": "object",
      "required": ["type"],
      "oneOf": [
        {
          "additionalProperties": false,
          "required": ["type", "entityType", "predicate"],
          "properties": {
            "type": { "const": "required-predicate" },
            "entityType": { "type": "string" },
            "predicate": { "type": "string" }
          }
        },
        {
          "additionalProperties": false,
          "required": ["type", "predicate"],
          "properties": {
            "type": { "const": "cardinality" },
            "predicate": { "type": "string" },
            "entityType": { "type": "string" },
            "min": { "type": "integer", "minimum": 0 },
            "max": { "type": "integer", "minimum": 0 }
          }
        },
        {
          "additionalProperties": false,
          "required": ["type", "predicate"],
          "properties": {
            "type": { "const": "unique" },
            "predicate": { "type": "string" },
            "entityType": { "type": "string" },
            "scope": { "type": "string", "enum": ["ontology", "entity-type"], "default": "ontology" }
          }
        },
        {
          "additionalProperties": false,
          "required": ["type", "predicate", "values"],
          "properties": {
            "type": { "const": "allowed-values" },
            "predicate": { "type": "string" },
            "values": { "type": "array", "items": {}, "minItems": 1 }
          }
        },
        {
          "additionalProperties": false,
          "required": ["type", "predicate"],
          "properties": {
            "type": { "const": "domain-range" },
            "predicate": { "type": "string" },
            "from": { "type": "array", "items": { "type": "string" } },
            "to": { "type": "array", "items": { "type": "string" } }
          }
        },
        {
          "additionalProperties": false,
          "required": ["type", "predicate"],
          "properties": {
            "type": { "const": "temporal-bounds" },
            "predicate": { "type": "string" },
            "notBefore": { "type": "string", "format": "date-time" },
            "notAfter": { "type": "string", "format": "date-time" },
            "requireValidFrom": { "type": "boolean" }
          }
        },
        {
          "additionalProperties": false,
          "required": ["type", "query"],
          "properties": {
            "type": { "const": "query" },
            "query": { "type": "string", "description": "Saved query id. Any result row is a violation." },
            "expect": { "type": "string", "enum": ["empty", "non-empty"], "default": "empty" }
          }
        }
      ]
    }
  }
}