code: func (obj *Doc) GetFileTablesEx(ctx context.Context, connectionId string, relativePath string, dataFormat *FileDataFormat) ([]*DataTableEx, error) {
  	result := &struct {
  		Tables []*DataTableEx	`json:"qTables"`
  	} {}
  	err := obj.rpc(ctx, "GetFileTablesEx", result, connectionId, relativePath, dataFormat)
  	return result.Tables, err 
  }
docs: // Lists the tables and fields of a JSON or XML file for a folder connection.
  //
  // Parameters:
  //
  // ◾ connectionId   -   Identifier of the connection.
  //
  // ◾ relativePath   -   Path of the connection file.
  //
  // ◾ dataFormat     -   Type of the file.
  //