profiles.py 文件源码

def _time_interval(self, subject, predicate):
        '''
        Returns the start and end date for a time interval object

        Both subject and predicate must be rdflib URIRef or BNode objects

        It checks for time intervals defined with both schema.org startDate &
        endDate and W3C Time hasBeginning & hasEnd.

        Note that partial dates will be expanded to the first month / day
        value, eg '1904' -> '1904-01-01'.

        Returns a tuple with the start and end date values, both of which
        can be None if not found
        '''

        start_date = end_date = None

        for interval in self.g.objects(subject, predicate):
            # Fist try the schema.org way
            start_date = self._object_value(interval, SCHEMA.startDate)
            end_date = self._object_value(interval, SCHEMA.endDate)

            if start_date or end_date:
                return start_date, end_date

            # If no luck, try the w3 time way
            start_nodes = [t for t in self.g.objects(interval,
                                                     TIME.hasBeginning)]
            end_nodes = [t for t in self.g.objects(interval,
                                                   TIME.hasEnd)]
            if start_nodes:
                start_date = self._object_value(start_nodes[0],
                                                TIME.inXSDDateTime)
            if end_nodes:
                end_date = self._object_value(end_nodes[0],
                                              TIME.inXSDDateTime)

        return start_date, end_date