Return the dict containing document metadata

def _parse_metadata(self, meta):
        """Return the dict containing document metadata"""
        formatted_fields = self.settings['FORMATTED_FIELDS']

        output = collections.OrderedDict()
        for name, value in meta.items():
            name = name.lower()
            if name in formatted_fields:
                rendered = self._render(value).strip()
                output[name] = self.process_metadata(name, rendered)
            else:
                output[name] = self.process_metadata(name, value)
        return output