code: def _getXMLMetricNames(self):
      dataNames = sstruct.getformat(bitmapSizeTableFormatPart1)[1]
      dataNames = (
          dataNames + sstruct.getformat(bitmapSizeTableFormatPart2)[1]
      )
      # Skip the first 3 data names because they are byte offsets and counts.
      return dataNames[3:]
  
imports: from fontTools.misc import sstruct
  from .None import DefaultTable
  from fontTools.misc.textTools import bytesjoin, safeEval
  from .BitmapGlyphMetrics import BigGlyphMetrics, bigGlyphMetricsFormat, SmallGlyphMetrics, smallGlyphMetricsFormat
  import struct
  import itertools
  from collections import deque
  import logging
label_desc: Use image node_id 1 for calling the BitmapSizeTable obj's underlying member method code with example usage: obj._getXMLMetricNames() and returns: dataNames