def authkeywords(self):
        """List of author-provided keywords of the abstract."""
        keywords = self._json['authkeywords']
        if keywords is None:
            return None
        else:
            try:
                return [d['$'] for d in keywords['author-keyword']]
            except TypeError:  # Singleton keyword
                return [keywords['author-keyword']['$']]
def authkeywords ( self ) : keywords = self . _json [ 'authkeywords' ] if keywords is None : return None else : try : return [ d [ '$' ] for d in keywords [ 'author-keyword' ] ] except TypeError : return [ keywords [ 'author-keyword' ] [ '$' ] ]
List of author-provided keywords of the abstract.