{
  "title": "Sigma-Aldrich Product Catalog Structure",
  "description": "Data model for Sigma-Aldrich research chemical and biochemical products",
  "type": "object",
  "structure": {
    "Product": {
      "description": "A research chemical, biochemical, or laboratory supply in the Sigma-Aldrich catalog",
      "fields": {
        "catalogNumber": { "type": "string", "role": "identifier" },
        "name": { "type": "string", "role": "label" },
        "brand": { "type": "enum", "values": ["Sigma", "Aldrich", "Fluka", "Supelco"], "role": "brand" },
        "casNumber": { "type": "string", "role": "chemical-identifier", "format": "CAS Registry Number" },
        "formula": { "type": "string", "role": "chemical-identifier", "format": "Molecular Formula" },
        "molecularWeight": { "type": "number", "role": "measurement", "unit": "g/mol" },
        "smiles": { "type": "string", "role": "chemical-structure" },
        "inchi": { "type": "string", "role": "chemical-structure" },
        "purity": { "type": "string", "role": "specification" },
        "grade": { "type": "string", "role": "classification" },
        "physicalState": { "type": "enum", "values": ["solid", "liquid", "gas"], "role": "physical-property" }
      },
      "children": {
        "PackagingOption": {
          "description": "An available package size and container format for a product",
          "fields": {
            "packSize": { "type": "string", "role": "quantity" },
            "packagingType": { "type": "string", "role": "container" }
          },
          "children": {
            "PriceOption": {
              "description": "Pricing and availability for a specific packaging in a region",
              "fields": {
                "country": { "type": "string", "role": "geography" },
                "currency": { "type": "string", "role": "currency" },
                "price": { "type": "number", "role": "price" },
                "stockLevel": { "type": "enum", "values": ["in-stock", "low-stock", "out-of-stock", "discontinued"] },
                "leadTimeDays": { "type": "integer", "role": "delivery" }
              }
            }
          }
        },
        "SafetyDataSheet": {
          "description": "GHS-compliant Safety Data Sheet containing hazard and handling information",
          "fields": {
            "version": { "type": "string", "role": "version" },
            "revisionDate": { "type": "date", "role": "temporal" },
            "language": { "type": "string", "role": "locale" },
            "pdfUrl": { "type": "uri", "role": "document" }
          }
        }
      }
    }
  }
}