class_docstr: Tag in FIF tree structure.
docstr: The next tag position.
code: def next_pos(self):
      """The next tag position."""
      if self.next == FIFF.FIFFV_NEXT_SEQ:  # 0
          return self.pos + 16 + self.size
      elif self.next > 0:
          return self.next
      else:  # self.next should be -1 if we get here
          return None
  
imports: import html
  import re
  import struct
  from dataclasses import dataclass
  from functools import partial
  from typing import Any
  import numpy
  from scipy.sparse import csc_matrix, csr_matrix
  from ..utils import _check_option, warn
  from ..utils.numerics import _julian_to_cal
  from .constants import FIFF, _ch_coil_type_named, _ch_kind_named, _ch_unit_mul_named, _ch_unit_named, _dig_cardinal_named, _dig_kind_named
label_desc: Use image node_id 2 for calling the Tag obj's underlying member method code with example usage: obj.next_pos() and returns: unknown, self, None