{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "schema://yams/graph_delta_v1",
  "title": "Graph Delta v1 — Append-only changesets for property-graphs",
  "type": "array",
  "items": {
    "type": "object",
    "properties": {
      "op": {
        "type": "string",
        "enum": [
          "add_node", "remove_node",
          "add_edge", "remove_edge",
          "set_node_props", "set_edge_props",
          "merge_node_props", "merge_edge_props"
        ]
      },
      "graph_id": { "type": "string" },
      "id": { "type": "string" },
      "src": { "type": "string" },
      "dst": { "type": "string" },
      "label": { "type": "string" },
      "weight": { "type": "number" },
      "properties": {
        "type": "object",
        "additionalProperties": {
          "anyOf": [
            { "type": "string" },
            { "type": "number" },
            { "type": "boolean" },
            { "type": "null" }
          ]
        }
      },
      "ts": { "type": "string", "format": "date-time" },
      "author": { "type": "string" },
      "txn": { "type": "string", "description": "Optional transaction id to group changes" }
    },
    "required": ["op"],
    "additionalProperties": true,
    "allOf": [
      {
        "if": { "properties": { "op": { "const": "add_node" } } },
        "then": { "required": ["id"] }
      },
      {
        "if": { "properties": { "op": { "const": "remove_node" } } },
        "then": { "required": ["id"] }
      },
      {
        "if": { "properties": { "op": { "const": "add_edge" } } },
        "then": { "required": ["id", "src", "dst"] }
      },
      {
        "if": { "properties": { "op": { "const": "remove_edge" } } },
        "then": { "required": ["id"] }
      },
      {
        "if": { "properties": { "op": { "const": "set_node_props" } } },
        "then": { "required": ["id", "properties"] }
      },
      {
        "if": { "properties": { "op": { "const": "set_edge_props" } } },
        "then": { "required": ["id", "properties"] }
      }
    ]
  }
}