Function load_from_file 

pub fn load_from_file(file_path: &Path) -> Result<Resource, String>

Loads a FHIR resource from a JSON file.

The file is read as UTF-8 text and deserialized into a [Resource] using serde_json.

Arguments

• file_path - The path to the JSON file containing the FHIR resource.

Errors

Returns an error if:

• The file cannot be read from the provided path.
• The file contents cannot be parsed as valid JSON.
• The parsed JSON does not match the expected [Resource] structure.

The returned error message includes the underlying cause of the failure.