code: def _get_toc_reference(app, node, toc, docname):
      
      if isinstance(node, nodes.section) and isinstance(node.parent, nodes.document):
          # Top Level Section header
          ref_id = docname
          toc_reference = _find_toc_node(toc, ref_id, nodes.section)
      elif isinstance(node, nodes.section):
          # Nested Section header
          ref_id = node.attributes["ids"][0]
          toc_reference = _find_toc_node(toc, ref_id, nodes.section)
      else:
          # Desc node
          try:
              ref_id = node.children[0].attributes["ids"][0]
              toc_reference = _find_toc_node(toc, ref_id, addnodes.desc)
          except (KeyError, IndexError) as e:
              LOGGER.warning("Invalid desc node: %s" % e)
              toc_reference = None
  
      return toc_reference
docs: Logic that understands maps a specific node to it's part of the toctree.
  
      It takes a specific incoming ``node``,
      and returns the actual TOC Tree node that is said reference.