{
  "type": "object",
  "description": "Describes a relationship type for an entity type.",
  "name": "EntityTypeRelationship",
  "properties": {
    "id": {
      "type": "string",
      "description": "The relationship type identifier, e.g., runsOn."
    },
    "toTypes": {
      "type": "array",
      "description": "The entity types that can participate in this relationship.",
      "items": {
        "type": "string"
      }
    }
  },
  "$schema": "https://json-structure.org/draft/2020-12/schema"
}