code: def defaults(self):
          
          return dict(
              access_right='open',
              description=self.description,
              license='other-open',
              publication_date=self.release['published_at'][:10],
              related_identifiers=list(self.related_identifiers),
              version=self.version,
              title=self.title,
              upload_type='software',
          )
docs: Return default metadata.