任意の操作の「コンテンツ」でトランザクション操作を行うことは可能ですか？

この質問は、ノードからのAPI応答の操作の内容に関するものです.特定の操作ですべてのトランザクションを識別しようとしています.

ブロックに対して返されるすべての操作でトランザクションを常にスキャンする必要がありますか、それともそれが不可能なシナリオがいくつかありますか?

たとえば、承認された操作の内容にトランザクションを含めることは可能ですか?例を表すために作成したサンプルJSONは次のとおりです.

 {
  "protocol": "PsddFKi32cMJ2qPjf43Qv5GDWLDPZb3T3bF6fLKiF5HtvHNU7aP",
  "chain_id": "NetXgtSLGNJvNye",
  "hash": "ooUykPzNucdysptCM4FKVhSW9k3WcXFKYhBy9GGTGfPZd7VrByR",
  "branch": "BLScMeAbnkVCfWpqSL26yS7nymoc5pHibXPaG8vAiY8NijPs8ph",
  "contents": [
    {
      "kind": "endorsement",
      "level": 202960,
      "metadata": {
        "balance_updates": [
          {
            "kind": "contract",
            "contract": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
            "change": "-128000000"
          },
          {
            "kind": "freezer",
            "category": "deposits",
            "delegate": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
            "level": 99,
            "change": "128000000"
          },
          {
            "kind": "freezer",
            "category": "rewards",
            "delegate": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
            "level": 99,
            "change": "2000000"
          }
        ],
        "delegate": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
        "slots": [
          13,
          12
        ]
      }
    },
    {
      "kind": "transaction",
      "source": "tz1NKVAxzJusWgKewn4LEViPSQVRE5Kg6XFV",
      "fee": "0",
      "counter": "2",
      "gas_limit": "105968",
      "storage_limit": "0",
      "amount": "0",
      "destination": "KT1WPEis2WhAc2FciM2tZVn8qe6pCBe9HkDp",
      "parameters": {
        "prim": "Right",
        "args": [
          {
            "prim": "None"
          }
        ]
      },
      "metadata": {
        "balance_updates": [],
        "operation_result": {
          "status": "applied",
          "storage": {
            "prim": "Pair",
            "args": [
            ]
          },
          "consumed_gas": "105868",
          "storage_size": "5157"
        }
      }
    }
  ],
  "signature": "signoVkqnvViqwNSpdf8fykaguasvzCxWYQry5hPT5nciAoFYRGxsRBTLDxeeDbVDQGGtyGJGazPtWJXiXZ9pi7hjeiJMnct"
}
 

This questions is about the contents of an operation in the API responses from the node. I'm trying to identify all transactions in a given operation.

Should I always scan for transactions in every operation returned for a block or are there some scenarios where that isn't possible?

For example, is it possible for an operation with a endorsement to include a transaction in its contents? Here's a sample JSON that I made up to represent the example:

{
  "protocol": "PsddFKi32cMJ2qPjf43Qv5GDWLDPZb3T3bF6fLKiF5HtvHNU7aP",
  "chain_id": "NetXgtSLGNJvNye",
  "hash": "ooUykPzNucdysptCM4FKVhSW9k3WcXFKYhBy9GGTGfPZd7VrByR",
  "branch": "BLScMeAbnkVCfWpqSL26yS7nymoc5pHibXPaG8vAiY8NijPs8ph",
  "contents": [
    {
      "kind": "endorsement",
      "level": 202960,
      "metadata": {
        "balance_updates": [
          {
            "kind": "contract",
            "contract": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
            "change": "-128000000"
          },
          {
            "kind": "freezer",
            "category": "deposits",
            "delegate": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
            "level": 99,
            "change": "128000000"
          },
          {
            "kind": "freezer",
            "category": "rewards",
            "delegate": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
            "level": 99,
            "change": "2000000"
          }
        ],
        "delegate": "tz1YCABRTa6H8PLKx2EtDWeCGPaKxUhNgv47",
        "slots": [
          13,
          12
        ]
      }
    },
    {
      "kind": "transaction",
      "source": "tz1NKVAxzJusWgKewn4LEViPSQVRE5Kg6XFV",
      "fee": "0",
      "counter": "2",
      "gas_limit": "105968",
      "storage_limit": "0",
      "amount": "0",
      "destination": "KT1WPEis2WhAc2FciM2tZVn8qe6pCBe9HkDp",
      "parameters": {
        "prim": "Right",
        "args": [
          {
            "prim": "None"
          }
        ]
      },
      "metadata": {
        "balance_updates": [],
        "operation_result": {
          "status": "applied",
          "storage": {
            "prim": "Pair",
            "args": [
            ]
          },
          "consumed_gas": "105868",
          "storage_size": "5157"
        }
      }
    }
  ],
  "signature": "signoVkqnvViqwNSpdf8fykaguasvzCxWYQry5hPT5nciAoFYRGxsRBTLDxeeDbVDQGGtyGJGazPtWJXiXZ9pi7hjeiJMnct"
}