{
  "fictional": true,
  "key": "profile_reference",
  "comparison": "Exact key strings, no name matching or normalization",
  "common": [
    "https://example.invalid/record/a"
  ],
  "beforeOnly": [
    "https://example.invalid/record/b"
  ],
  "afterOnly": [
    "https://example.invalid/record/c"
  ],
  "limitation": "File membership differences only. Sources are constructed; absence does not establish a removed connection or complete collection."
}