Added value: +{
+  "description": "A stated assumption that materially affects the figures, when one applies (e.g. no carried-forward concessional cap)",
+  "type": "string"
+}

Added value: +{
+  "additionalProperties": false,
+  "description": "One sourced background fact about the country's superannuation; the figures do not depend on it. Absent when no sourced fact fits.",
+  "properties": {
+    "context": {
+      "description": "Present on a state or provincial answer: the fact is about the country as a whole",
+      "enum": [
+        "national"
+      ],
+      "type": "string"
+    },
+    "country": {
+      "description": "2-letter ISO code of the country the fact is about",
+      "type": "string"
+    },
+    "detail": {
+      "description": "Longer supporting detail, when the corpus has it",
+      "type": "string"
+    },
+    "fact": {
+      "description": "The fact, in one or two sentences",
+      "type": "string"
+    },
+    "kind": {
+      "description": "'origin' = when the tax began and what it replaced; 'anniversary' = the same, on the anniversary of its start date; 'story' = a dated story from the facts corpus",
+      "enum": [
+        "origin",
+        "story",
+        "anniversary"
+      ],
+      "type": "string"
+    },
+    "more": {
+      "description": "The tool that returns the full sourced fact set for this country",
+      "enum": [
+        "tax_facts"
+      ],
+      "type": "string"
+    },
+    "sourceName": {
+      "description": "Who the fact is sourced to",
+      "type": "string"
+    },
+    "sourceUrl": {
+      "description": "Link to that source — always present",
+      "type": "string"
+    },
+    "topic": {
+      "description": "Which tax the fact is about",
+      "enum": [
+        "gst",
+        "income",
+        "company",
+        "cgt",
+        "super",
+        "studentloan",
+        "general"
+      ],
+      "type": "string"
+    },
+    "verifiedDate": {
+      "description": "ISO date the fact was last checked against its source, when recorded",
+      "type": "string"
+    }
+  },
+  "required": [
+    "kind",
+    "topic",
+    "country",
+    "fact",
+    "sourceName",
+    "sourceUrl",
+    "more"
+  ],
+  "type": "object"
+}

Added value: +{
+  "description": "https link to the authority page the rate was verified against. Present only on rate answers backed by a verified ledger row — absent (never empty) otherwise, so its presence is itself the claim",
+  "type": "string"
+}