code: def _to_io_meta(shape_meta, valid_keys, key_mappings):
      
  
      meta = dict()
  
      for key in shape_meta:
          if key in valid_keys:
              meta[key_mappings.get(key, key)] = shape_meta[key]
  
      return meta
docs: This is used to make meta data compatible with a specific io
      by filtering and mapping to it's valid keys
  
      Parameters
      ----------
      shape_meta: dict
          meta attribute of a `regions.Region` object
      valid_keys : python list
          Contains all the valid keys of a particular file format.
      key_mappings : python dict
          Maps to the actual name of the key in the format.
  
      Returns
      -------
      meta : dict
          io compatible meta dictionary according to valid_keys and key_mappings