private JsonSchema4 ResolveFileReference(string url, string jsonPath)
        {
            if (DynamicApis.SupportsFileApis)
            {
                try
                {
                    var arr = Regex.Split(url, @"(?=#)");

                    if (!_resolvedSchemas.ContainsKey(arr[0]))
                    {
                        JsonSchema4.FromFile(arr[0], this);
                    }

                    var result = _resolvedSchemas[arr[0]];
                    return(arr.Length == 1 ? result : ResolveReference(result, arr[1]));
                }
                catch (Exception exception)
                {
                    throw new InvalidOperationException("Could not resolve the path '" + jsonPath + "' with the file path '" + url + "': " + exception.Message, exception);
                }
            }
            else
            {
                throw new NotSupportedException("Could not resolve the path '" + jsonPath +
                                                "' because JSON file references are not supported on this platform.");
            }
        }
 /// <summary>Resolves a file reference.</summary>
 /// <param name="filePath">The file path.</param>
 /// <returns>The resolved JSON Schema.</returns>
 /// <exception cref="System.NotSupportedException">Could not resolve the JSON path because file references are not supported on this platform.</exception>
 protected virtual JsonSchema4 ResolveFileReference(string filePath)
 {
     if (DynamicApis.SupportsFileApis)
     {
         return(JsonSchema4.FromFile(filePath, this));
     }
     else
     {
         throw new NotSupportedException("Could not resolve the JSON path because file references are not supported on this platform.");
     }
 }