def add(self, elem, replace=False):
        """Add a requirement.

        :param elem: a string or :class:`Requirement` instance.
        :param replace: if `True`, packages in the set with the same name will
            be removed first.
        """
        if isinstance(elem, text_type):
            elem = Requirement.coerce(elem)
        if replace and elem in self:
            self.remove(elem)
        super(Requirements, self).add(elem)
def parse_record(self, metadata, line):
        factors = line.split('|')
        if len(factors) < 7:
            return

        registry, cc, type_, start, value, dete, status = factors[:7]
        if type_ not in ('ipv4', 'ipv6'):
            return

        return Record(metadata, start, type_, value, cc)