Previous value: -"WEM tracked link to the retailer page for this offer. WEM never takes payment."New value: +"The page this price was read on. Give this url to the user when you name the price; a different url can be a different listing or price. The full URL; a shortened form is a different link. WEM never takes payment."

Added value: +{
+  "description": "The prices in this result as lines, cheapest first. Give these to the user when you name a price from this result. Each line opens the retailer page for that price; a retailer URL found elsewhere may be a different listing or price.",
+  "items": {
+    "properties": {
+      "currency": {
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "markdown": {
+        "description": "The same link as `[Retailer — £0.00](url)`, for hosts rendering markdown.",
+        "type": "string"
+      },
+      "price": {
+        "description": "Null when the row has no figure. The markdown then says where to see the price.",
+        "type": [
+          "number",
+          "null"
+        ]
+      },
+      "retailer": {
+        "type": "string"
+      },
+      "url": {
+        "description": "The page this price was read on. The full URL; a shortened or rewritten form is a different link.",
+        "type": "string"
+      }
+    },
+    "type": "object"
+  },
+  "type": "array"
+}

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Retailer slug, e.g. \"ebay\", \"currys\"."New value: +"Retailer slug, e.g. \"amazon\", \"currys\"."

Added value: +"Delivery as the retailer stated it: `free`, or `cost` in the offer currency. Absent or null means not stated: say delivery is shown at the shop, never that it is free. Offers are ordered by item price; add a stated cost before calling one cheaper delivered."

Previous value: -"List of products to compare (2-5 items)"New value: +"2 to 5 listings, each with `provider` and `product_id` as given in a search result."

Previous value: -"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. It is still a real offer, and its link is not affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` states whether all, some or none of the links are tracked."

Previous value: -"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers."New value: +"retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. A marketplace cluster is not a set of competing authorised retailers."

Previous value: -"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: the note stands in place of a figure."

Previous value: -"Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."New value: +"Present only when `price` is null: the words that stand in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now."

Previous value: -"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described."New value: +"Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. It reads as \"from £X\"; it is not the item's price or the cheapest. Absent means the price is firm for the row as described."

Previous value: -"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now."New value: +"`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Those two read as \"last seen £X on 8 Sep\" or \"price not dated\", come after the current ones, and are not compared. Absent on a row a provider answered just now."

Previous value: -"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."New value: +"Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. Across sizes, value is compared on these, not on the prices: a smaller size is not cheaper because its price is lower. It reads beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit."

Previous value: -"WEM tracked link to the retailer. Send the user here — WEM never takes payment."New value: +"WEM tracked link to the retailer page for this offer. WEM never takes payment."

Previous value: -"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."New value: +"WEM’s affiliate disclosure for this answer, written to be quoted as it is. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. A version from an earlier answer may not fit this one: a row marked `affiliate: false` earns WEM nothing."

Previous value: -"Indicative price. The retailer sets the final price at checkout."New value: +"Indicative price. The retailer sets the final price at checkout. Null, with `priceNote`, when WEM may not show this listing’s price: show the note and the link, never a figure of your own."

Previous value: -"number"New value: +[
+  "number",
+  "null"
+]

Added value: +{
+  "description": "Present only when `price` is null: the words to show in its place, e.g. \"See price at Amazon\". An Amazon price is shown only when Amazon’s API supplied it just now.",
+  "type": "string"
+}

Added value: +{
+  "description": "`current`: WEM read this price within the last 14 days; only a current price may lead, be called the cheapest or lowest, be compared or enter a saving. `stale`: read longer ago. `undated`: WEM cannot say when. Show those two as \"last seen £X on 8 Sep\" or \"price not dated\", after the current ones, and never compare them. Absent on a row a provider answered just now.",
+  "enum": [
+    "current",
+    "stale",
+    "undated"
+  ],
+  "type": "string"
+}

Previous value: -"False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path."New value: +"False when this link earns WEM nothing: the shop has no affiliate programme with WEM, or this link does not carry one. Still a real offer: list it with the others, and never call its link affiliate-tracked. Absent (or true) means the link is affiliate-tracked. `disclosure` already states whether all, some or none of the links are tracked; relay that rather than your own wording."

Added value: +{
+  "description": "Price per 100ml, 100g, litre, kg or item, from the size this row's title states. Present only when the rows differ in size, in one unit across all of them, and only for things bought by the amount (beauty, food, supplements), never an appliance's capacity. When comparing value across sizes, compare these, never the prices: a smaller size is not cheaper because its price is lower. Quote it beside the price (\"£29.95, £99.83 per 100ml\"). Absent does not mean the price is per unit.",
+  "properties": {
+    "amount": {
+      "type": "number"
+    },
+    "currency": {
+      "description": "ISO 4217 code.",
+      "type": "string"
+    },
+    "per": {
+      "enum": [
+        "100ml",
+        "litre",
+        "100g",
+        "kg",
+        "item"
+      ],
+      "type": "string"
+    }
+  },
+  "type": "object"
+}

Previous value: -"Affiliate disclosure to relay once per answer. Outbound links are tracked at no extra cost to the buyer."New value: +"Disclosure to relay once per answer, verbatim. Its wording changes with the rows: it states whether every outbound link is affiliate-tracked, only some are, or none are. Never substitute the version you saw last time — a row marked `affiliate: false` earns WEM nothing, and saying otherwise misdescribes it to the shopper."

Added value: +{
+  "description": "Present when `price` is the OPENING price of a range, not the price of this item: a multi-variation listing where the seller advertises its cheapest variant and the shopper picks a size on the page. Quote it as \"from £X\", never as the price or the cheapest. Absent means the price is firm for the row as described.",
+  "enum": [
+    "from"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "retailer is a named shop (Boots, Currys). marketplace is eBay/AliExpress/Temu-style parallel listings. Do not present a marketplace cluster as competing authorised retailers.",
+  "enum": [
+    "retailer",
+    "marketplace"
+  ],
+  "type": "string"
+}

Added value: +{
+  "description": "Delivery window when the feed stated one.",
+  "type": [
+    "string",
+    "null"
+  ]
+}

Added value: +{
+  "description": "False when this is a retailer page WEM observed without a programme. Still a real listing; the click is not commission-bearing. Absent means the usual partner path.",
+  "type": "boolean"
+}

Previous value: -nullNew value: +{
+  "properties": {
+    "comparison": {
+      "items": {
+        "properties": {
+          "badges": {
+            "items": {
+              "type": "string"
+            },
+            "type": [
+              "array",
+              "null"
+            ]
+          },
+          "brand": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "currency": {
+            "description": "ISO 4217 code.",
+            "type": "string"
+          },
+          "features": {
+            "items": {
+              "type": "string"
+            },
+            "type": [
+              "array",
+              "null"
+            ]
+          },
+          "id": {
+            "type": "string"
+          },
+          "image": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "inStock": {
+            "type": [
+              "boolean",
+              "null"
+            ]
+          },
+          "price": {
+            "description": "Indicative price. The retailer sets the final price at checkout.",
+            "type": "number"
+          },
+          "provider": {
+            "description": "Retailer slug, e.g. \"ebay\", \"currys\".",
+            "type": "string"
+          },
+          "rating": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "reviewCount": {
+            "type": [
+              "number",
+              "null"
+            ]
+          },
+          "seller": {
+            "type": [
+              "string",
+              "null"
+            ]
+          },
+          "shipping": {
+            "properties": {
+              "cost": {
+                "type": [
+                  "number",
+                  "null"
+                ]
+              },
+              "free": {
+                "type": "boolean"
+              }
+            },
+            "type": [
+              "object",
+              "null"
+            ]
+          },
+          "title": {
+            "type": "string"
+          },
+          "url": {
+            "description": "WEM tracked link to the retailer. Send the user here — WEM never takes payment.",
+            "type": "string"
+          }
+        },
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "count": {
+      "type": "number"
+    },
+    "disclosure": {
+      "description": "Affiliate disclosure to relay once per answer. Outbound links are tracked at no extra cost to the buyer.",
+      "type": "string"
+    }
+  },
+  "required": [
+    "comparison",
+    "count",
+    "disclosure"
+  ],
+  "type": "object"
+}