{
  "schemaVersion": "1.0",
  "ruleset": "dimension-comparison/1.0.0",
  "exampleOnly": true,
  "updated": "2026-09-20",
  "canonicalUrl": "https://www.iamgeorgekelly.com/field-guide/product-dimensions-unit-conversion",
  "scope": "Ten authored fixtures, not a sample of merchant data or an AI benchmark. Expected statuses are checked against the downloadable local runner. Evidence references are fictional and are not fetched.",
  "cases": [
    {
      "id": "equivalent-units",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "match",
      "reason": "The named axes are equal after conversion."
    },
    {
      "id": "different-height",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "mismatch",
      "reason": "Height differs by 2 mm."
    },
    {
      "id": "package-is-not-product",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "package",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "hold",
      "reason": "A carton measurement is a different fact."
    },
    {
      "id": "different-item",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-02",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "hold",
      "reason": "Equal dimensions cannot resolve item identity."
    },
    {
      "id": "missing-unit",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "hold",
      "reason": "No default unit is inferred."
    },
    {
      "id": "swapped-axes",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "30.48",
            "unit": "cm"
          },
          "width": {
            "value": "60.96",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "mismatch",
      "reason": "Matching sets of numbers do not resolve axis orientation."
    },
    {
      "id": "missing-axis",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "hold",
      "reason": "A complete named three-axis comparison is required."
    },
    {
      "id": "explicit-rounding-tolerance",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "61",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0.5"
      },
      "expectedStatus": "match",
      "reason": "The 0.4 mm difference falls within the supplied tolerance, not a verified engineering tolerance."
    },
    {
      "id": "rounding-with-zero-tolerance",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "61",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "mismatch",
      "reason": "A 0.4 mm difference is not silently rounded away."
    },
    {
      "id": "range-needs-interpretation",
      "input": {
        "schemaVersion": "1.0",
        "source": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-spec-sheet:page-3",
          "length": {
            "value": "24-26",
            "unit": "in"
          },
          "width": {
            "value": "12",
            "unit": "in"
          },
          "height": {
            "value": "30",
            "unit": "in"
          }
        },
        "candidate": {
          "itemId": "EXAMPLE-STAND-01",
          "basis": "product",
          "evidenceRef": "fictional-export:row-7",
          "length": {
            "value": "60.96",
            "unit": "cm"
          },
          "width": {
            "value": "30.48",
            "unit": "cm"
          },
          "height": {
            "value": "76.2",
            "unit": "cm"
          }
        },
        "toleranceMm": "0"
      },
      "expectedStatus": "hold",
      "reason": "A range is not one measured value."
    }
  ]
}