class_docstr: An Application is a factory for Document instances.
  
      
class_docstr_tok: ["An","Application","is","a","factory","for","Document","instances","."]
docstr: Arbitrary user-supplied metadata to associate with this application.
  
          
docstr_tok: ["Arbitrary","user-supplied","metadata","to","associate","with","this","application","."]
code: def metadata(self) -> dict[str, Any] | None:
      """Arbitrary user-supplied metadata to associate with this application."""
      return self._metadata
  
imports: from __future__ import annotations
  import logging
  from abc import ABCMeta, abstractmethod
  from typing import TYPE_CHECKING, Any, Awaitable, Callable, ClassVar
  from ..core.types import ID
  from ..document import Document
  from ..settings import settings
label_desc: Use image node_id 3 for calling the Application obj's underlying member method code with example usage: obj.metadata() and returns: self