{
  "青山誠一": {
    "party": "サンプル党",
    "first_elected_year": 2003,
    "sources": [
      {
        "url": "https://example.com/members/aoyama",
        "type": "official_profile",
        "provides": ["party"]
      },
      {
        "url": "https://example.com/wiki/aoyama",
        "type": "wikipedia",
        "provides": ["first_elected_year"]
      }
    ]
  },
  "北村和子": {
    "party": "サンプル党",
    "first_elected_year": 1986,
    "sources": [
      {
        "url": "https://example.com/news/kitamura",
        "type": "news",
        "provides": ["party", "first_elected_year"]
      }
    ]
  }
}