get_info
Description:
This function returns a particular metadata entry in the given namespace namespace_.
The namespace must have already been loaded before calling this function. See get_n_infos to find the maximum number of entries.
Parameters:
| this | 
           A Repository or   | 
      
| namespace_ | 
           Namespace to inspect  | 
      
| index | 
           0-based offset into namespace metadata for entry  | 
      
Returns:
| 
           BaseInfo containing metadata  |