code: def ExtractPathSpecs(
        self, path_specs, find_specs=None, recurse_file_system=True,
        resolver_context=None):
      
      for path_spec in path_specs:
        for extracted_path_spec in self._ExtractPathSpecs(
            path_spec, find_specs=find_specs,
            recurse_file_system=recurse_file_system,
            resolver_context=resolver_context):
          yield extracted_path_spec
docs: Extracts path specification from a specific source.
  
      Args:
        path_specs (Optional[list[dfvfs.PathSpec]]): path specifications.
        find_specs (Optional[list[dfvfs.FindSpec]]): find specifications.
        recurse_file_system (Optional[bool]): True if extraction should
            recurse into a file system.
        resolver_context (Optional[dfvfs.Context]): resolver context.
  
      Yields:
        dfvfs.PathSpec: path specification of a file entry found in the source.