docstr: Extract XML metadata from SPE v3 files
  
  Returns
  -------
  dict with key `"__xml"`, whose value is the XML metadata
docstr_tok: ["Extract","XML","metadata","from","SPE","v3","files","Returns","--","--","--","-","dict","with","key","`","``","__xml","''","`",",","whose","value","is","the","XML","metadata"]
code: def _metadata_post_v3(self) -> Dict[str, Any]:
      """Extract XML metadata from SPE v3 files
  
      Returns
      -------
      dict with key `"__xml"`, whose value is the XML metadata
      """
  
      info = self._parse_header(Spec.basic, "latin1")
      self._file.seek(info["xml_footer_offset"])
      xml = self._file.read()
      return {"__xml": xml}
  
imports: from datetime import datetime
  import logging
  import os
  from typing import Any, Callable, Dict, Iterator, List, Mapping, Optional, Sequence, Tuple, Union
  import warnings
  import numpy
  from ..core.request import Request, IOMode, InitializationError
  from ..core.v3_plugin_api import PluginV3, ImageProperties
label_desc: Use image node_id 6 for calling the SpePlugin obj's underlying member method code with example usage: obj._metadata_post_v3() and returns: dict