{
  "id": "type-n21",
  "revision": "9cdcae8f2f99ada2a1e4c639a8a867b35ed85d8af064523496622b4e4c58d197",
  "regions": [
    {
      "id": "server",
      "label": "Server",
      "parent": null
    },
    {
      "id": "storage",
      "label": "Storage",
      "parent": null
    }
  ],
  "nodes": [
    {
      "id": "a",
      "label": "Checkout A",
      "kind": "N06",
      "region": "server",
      "ports": [
        {
          "id": "reserve",
          "profile": "P09",
          "contract": "ReserveStockCompareVersionV1",
          "polarity": "Require"
        }
      ]
    },
    {
      "id": "b",
      "label": "Checkout B",
      "kind": "N06",
      "region": "server",
      "ports": [
        {
          "id": "reserve",
          "profile": "P09",
          "contract": "ReserveStockCompareVersionV1",
          "polarity": "Require"
        }
      ]
    },
    {
      "id": "stock",
      "label": "Inventory authority",
      "kind": "N21",
      "region": "storage",
      "ports": [
        {
          "id": "reserveA",
          "profile": "P09",
          "contract": "ReserveStockCompareVersionV1",
          "polarity": "Offer"
        },
        {
          "id": "reserveB",
          "profile": "P09",
          "contract": "ReserveStockCompareVersionV1",
          "polarity": "Offer"
        },
        {
          "id": "changed",
          "profile": "P04",
          "contract": "StockCommittedV1",
          "polarity": "Offer"
        }
      ]
    },
    {
      "id": "feed",
      "label": "Stock change topic",
      "kind": "N24",
      "region": "server",
      "ports": [
        {
          "id": "changed",
          "profile": "P04",
          "contract": "StockCommittedV1",
          "polarity": "Require"
        },
        {
          "id": "events",
          "profile": "P04",
          "contract": "StockCommittedV1",
          "polarity": "Offer"
        }
      ]
    },
    {
      "id": "view",
      "label": "Product availability view",
      "kind": "N22",
      "region": "server",
      "ports": [
        {
          "id": "update",
          "profile": "P04",
          "contract": "StockCommittedV1",
          "polarity": "Require"
        }
      ]
    }
  ],
  "relations": [
    {
      "id": "a",
      "kind": "H05",
      "incidences": [
        {
          "node": "a",
          "port": "reserve",
          "role": "caller",
          "ordinal": 0
        },
        {
          "node": "stock",
          "port": "reserveA",
          "role": "callee",
          "ordinal": 0
        }
      ]
    },
    {
      "id": "b",
      "kind": "H05",
      "incidences": [
        {
          "node": "b",
          "port": "reserve",
          "role": "caller",
          "ordinal": 0
        },
        {
          "node": "stock",
          "port": "reserveB",
          "role": "callee",
          "ordinal": 0
        }
      ]
    },
    {
      "id": "changed",
      "kind": "H04",
      "incidences": [
        {
          "node": "stock",
          "port": "changed",
          "role": "publisher",
          "ordinal": 0
        },
        {
          "node": "feed",
          "port": "changed",
          "role": "subscriber",
          "ordinal": 0
        }
      ]
    },
    {
      "id": "projection",
      "kind": "H04",
      "incidences": [
        {
          "node": "feed",
          "port": "events",
          "role": "publisher",
          "ordinal": 0
        },
        {
          "node": "view",
          "port": "update",
          "role": "subscriber",
          "ordinal": 0
        }
      ]
    }
  ]
}