class_docstr: An item in MkDocs structure - see concrete subclasses Section, Page or Link.
code: def _indent_print(self, depth: int = 0) -> str:
      return ("    " * depth) + repr(self)
  
imports: from __future__ import annotations
  import abc
  from typing import TYPE_CHECKING, Iterable
label_desc: Use image node_id 4 for calling the StructureItem obj's underlying member method code with example usage: obj._indent_print(depth) and returns: unknown