class_docstr: A node in a DAG. These should be immutable.
class_docstr_tok: ["A","node","in","a","DAG",".","These","should","be","immutable","."]
docstr: ID for uniquely identifying a given node.
docstr_tok: ["ID","for","uniquely","identifying","a","given","node","."]
code: def node_id(self) -> NodeId:
      """ID for uniquely identifying a given node."""
      return self._node_id
  
imports: from __future__ import annotations
  import html
  import logging
  import textwrap
  from abc import ABC, abstractmethod
  from dataclasses import dataclass
  from typing import Any, Generic, List, Sequence, TypeVar
  import jinja2
  from metricflow.dag.id_generation import IdGeneratorRegistry
  from metricflow.dag.id_prefix import IdPrefix
  from metricflow.dag.prefix_id import PrefixIdGenerator
  from metricflow.visitor import VisitorOutputT
label_desc: Use image node_id 2 for calling the DagNode obj's underlying member method code with example usage: obj.node_id() and returns: self