{
  "document_url": "https://example.com/multi-document.pdf",
  "split_rules": [
    {
      "category_name": "Invoice",
      "description": "A financial invoice document",
      "partition_key": "vendor_name"
    },
    {
      "category_name": "Contract",
      "description": "A legal contract or agreement"
    }
  ]
}