uv run rewrite_materials.py ../../../example/hello-wall.ifcx
{
  "header": {
    "id": "ifc5.technical.buildingsmart.org/examples/Hello Wall/hello-wall.ifcx",
    "ifcxVersion": "ifcx_alpha",
    "dataVersion": "1.0.0",
    "author": "technical@buildingsmart.org",
    "timestamp": "time string"
  },
  "imports": [
    {
      "uri": "https://ifcx.dev/@standards.buildingsmart.org/ifc/core/ifc@v5a.ifcx"
    },
    {
      "uri": "https://ifcx.dev/@standards.buildingsmart.org/ifc/core/prop@v5a.ifcx"
    },
    {
      "uri": "https://ifcx.dev/@standards.buildingsmart.org/ifc/ifc-mat/ifc-mat@v1.0.0.ifcx"
    },
    {
      "uri": "https://ifcx.dev/@openusd.org/usd@v1.ifcx"
    },
    {
      "uri": "https://ifcx.dev/@nlsfb/nlsfb@v1.ifcx"
    }
  ],
  "schemas": {
    "customdata": {
      "value": {
        "dataType": "Object",
        "objectRestrictions": {
          "values": {
            "originalStepInstance": {
              "dataType": "String"
            }
          }
        }
      }
    }
  },
  "data": [
    {
      "path": "25503984-6605-43a1-8597-eae657ff5bea",
      "children": {
        "Void": "8fada721-cff8-590b-8d0b-9300b5fe8e18",
        "Frame": "08f06095-3f32-55b9-a353-61c9aca5cc4d",
        "Glazing": "5ad6f475-c04c-5628-8b9d-75d0bab0c0e5"
      }
    },
    {
      "path": "14adb22b-d474-48a2-8e8f-6d4c067c1953",
      "children": {
        "My_Site": "e0834921-e095-40f0-8874-3c6bd1ec699e"
      }
    },
    {
      "path": "ab143723-f7b1-5368-b106-55896e88d768",
      "children": {
        "My_Project": "14adb22b-d474-48a2-8e8f-6d4c067c1953"
      }
    },
    {
      "path": "e0834921-e095-40f0-8874-3c6bd1ec699e",
      "children": {
        "My_Building": "e84dc79e-fe9d-4781-9f4b-54dd435cca91"
      }
    },
    {
      "path": "e84dc79e-fe9d-4781-9f4b-54dd435cca91",
      "children": {
        "My_Storey": "44af358b-3160-4063-8a89-a868335ff3b5"
      }
    },
    {
      "path": "44af358b-3160-4063-8a89-a868335ff3b5",
      "children": {
        "My_Space": "e3035b71-bd9f-4cdc-86fd-b56e2f4605b6",
        "Wall": "93791d5d-5beb-437b-b8ec-2f1f0ba4bf3b"
      }
    },
    {
      "path": "e3035b71-bd9f-4cdc-86fd-b56e2f4605b6",
      "children": {
        "Body": "15289df1-5ae0-5fc9-8399-19de1fbb87a0",
        "Boundary_Wall": "c8ecbf4c-e37a-4489-9133-15163b8a904e",
        "Boundary_Window": "cc40ef6e-950e-4b79-a802-4cc710294e3a",
        "Boundary_Window_001": "7f2a3284-bf01-4b0a-85e4-e48d92ba56dd"
      }
    },
    {
      "path": "93791d5d-5beb-437b-b8ec-2f1f0ba4bf3b",
      "children": {
        "Body": "634f90c3-831e-5f29-a9b2-fa69b207821e",
        "Axis": "8407e490-ceaa-56e5-96df-2351d9110668",
        "Directrix": "9d1fce89-e179-5076-9a3b-1b40eef3524b",
        "Basis": "367f7f7d-b4c5-50fe-829a-6bbced170dd1",
        "Window": "2c2d549f-f9fe-4e22-8590-562fda81a690",
        "Window_001": "592504dc-469a-44d6-9ae8-c801b591679b"
      }
    },
    {
      "path": "2c2d549f-f9fe-4e22-8590-562fda81a690",
      "inherits": {
        "windowType": "25503984-6605-43a1-8597-eae657ff5bea"
      }
    },
    {
      "path": "592504dc-469a-44d6-9ae8-c801b591679b",
      "inherits": {
        "windowType": "25503984-6605-43a1-8597-eae657ff5bea"
      }
    },
    {
      "path": "c8ecbf4c-e37a-4489-9133-15163b8a904e",
      "children": {
        "Body": "911155b7-f688-51ee-8e3e-b97475be2452"
      }
    },
    {
      "path": "cc40ef6e-950e-4b79-a802-4cc710294e3a",
      "children": {
        "Body": "f3aa8991-7481-5d6b-8dae-f98c372f4a98"
      }
    },
    {
      "path": "7f2a3284-bf01-4b0a-85e4-e48d92ba56dd",
      "children": {
        "Body": "126781f3-6465-5c39-9216-81cc636eeb39"
      }
    },
    {
      "path": "7a187a90-3dcf-58cc-b3a6-51a9a407c55a",
      "attributes": {
        "bsi::ifc::presentation::diffuseColor": [
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          0.5
        ],
        "bsi::ifc::presentation::opacity": 1,
        "bsi::ifc::material": {
          "code": "CONCRETE",
          "uri": "https://identifier.buildingsmart.org/uri/fish/midas-materials/26/class/CONCRETE"
        }
      }
    },
    {
      "path": "25503984-6605-43a1-8597-eae657ff5bea",
      "attributes": {
        "customdata": {
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        }
      }
    },
    {
      "path": "25503984-6605-43a1-8597-eae657ff5bea",
      "attributes": {
        "bsi::ifc::class": {
          "code": "IfcWindow",
          "uri": "https://identifier.buildingsmart.org/uri/buildingsmart/ifc/4.3/class/IfcWindow"
        }
      }
    },
    {
      "path": "25503984-6605-43a1-8597-eae657ff5bea",
      "attributes": {
        "bsi::ifc::prop::TypeName": "WT01"
      }
    },
    {
      "path": "8fada721-cff8-590b-8d0b-9300b5fe8e18",
      "attributes": {
        "usd::usdgeom::mesh": {
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          "points": [
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      }
    },
    {
      "path": "8fada721-cff8-590b-8d0b-9300b5fe8e18",
      "attributes": {
        "usd::usdgeom::visibility": {
          "visibility": "invisible"
        }
      }
    },
    {
      "path": "14adb22b-d474-48a2-8e8f-6d4c067c1953",
      "attributes": {
        "customdata": {
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        }
      }
    },
    {
      "path": "14adb22b-d474-48a2-8e8f-6d4c067c1953",
      "attributes": {
        "bsi::ifc::class": {
          "code": "IfcProject",
          "uri": "https://identifier.buildingsmart.org/uri/buildingsmart/ifc/4.3/class/IfcProject"
        }
      }
    },
    {
      "path": "e0834921-e095-40f0-8874-3c6bd1ec699e",
      "attributes": {
        "customdata": {
          "originalStepInstance": "#30=IfcSite('3WWqaXu9L0y8XqF6lHx6cU',$,'My Site',$,$,#53,$,$,$,$,$,$,$,$)"
        }
      }
    },
    {
      "path": "e0834921-e095-40f0-8874-3c6bd1ec699e",
      "attributes": {
        "bsi::ifc::class": {
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          "uri": "https://identifier.buildingsmart.org/uri/buildingsmart/ifc/4.3/class/IfcSite"
        }
      }
    },
    {
      "path": "e84dc79e-fe9d-4781-9f4b-54dd435cca91",
      "attributes": {
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        }
      }
    },
    {
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      "attributes": {
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          "uri": "https://identifier.buildingsmart.org/uri/buildingsmart/ifc/4.3/class/IfcBuilding"
        }
      }
    },
    {
      "path": "44af358b-3160-4063-8a89-a868335ff3b5",
      "attributes": {
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        }
      }
    },
    {
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      "attributes": {
        "bsi::ifc::class": {
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          "uri": "https://identifier.buildingsmart.org/uri/buildingsmart/ifc/4.3/class/IfcBuildingStorey"
        }
      }
    },
    {
      "path": "e3035b71-bd9f-4cdc-86fd-b56e2f4605b6",
      "attributes": {
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        }
      }
    },
    {
      "path": "e3035b71-bd9f-4cdc-86fd-b56e2f4605b6",
      "attributes": {
        "bsi::ifc::class": {
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          "uri": "https://identifier.buildingsmart.org/uri/buildingsmart/ifc/4.3/class/IfcSpace"
        }
      }
    },
    {
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        "bsi::ifc::presentation::opacity": 0.3
      }
    },
    {
      "path": "e3035b71-bd9f-4cdc-86fd-b56e2f4605b6",
      "attributes": {
        "usd::xformop": {
          "transform": [
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    },
    {
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    {
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      }
    },
    {
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    {
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