{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "title": "Ontology Evolution",
  "description": "Categorized ontology changes with effort and risk assessment",
  "type": "object",
  "required": ["base_version", "changes", "summary"],
  "properties": {
    "base_version": {
      "type": "string",
      "description": "Reference to the base ontology being evolved"
    },
    "changes": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["id", "category", "description", "effort", "risk"],
        "properties": {
          "id": { "type": "string", "pattern": "^EVO-[0-9]+$" },
          "category": { "type": "string", "enum": ["add_entity", "modify_entity", "remove_entity", "add_relationship", "modify_relationship", "remove_relationship", "add_invariant", "modify_boundary"] },
          "description": { "type": "string" },
          "effort": { "type": "string", "enum": ["trivial", "small", "medium", "large", "epic"] },
          "risk": { "type": "string", "enum": ["low", "medium", "high", "critical"] },
          "rationale": { "type": "string" },
          "affected_entities": { "type": "array", "items": { "type": "string" } }
        }
      }
    },
    "summary": {
      "type": "object",
      "required": ["total_changes", "breaking_changes"],
      "properties": {
        "total_changes": { "type": "integer", "minimum": 0 },
        "breaking_changes": { "type": "integer", "minimum": 0 },
        "estimated_effort": { "type": "string" }
      }
    }
  }
}