def add_filter(self, entry):
        """Parse and store the filter field"""
        entry = entry[10:-1]
        info = entry.split(',')
        if len(info) < 2:
            return False
        for v in info:
            key, value = v.split('=', 1)
            if key == 'ID':
                self.filter[value] = {}
                id_ = value
            elif key == 'Description':
                self.filter[id_]['description'] = value
                if len(info) > 2:
                    self.info[id_]['description'] += '; '.join(info[2:])
        return True
Parse and store the filter field