class_docstr: Base reader for prologue and epilogue files.
class_docstr_tok: ["Base","reader","for","prologue","and","epilogue","files","."]
docstr: Reduce the metadata.
code: def _reduce(self, mda, max_size):
      """Reduce the metadata."""
      if self._reduced is None:
          self._reduced = utils.reduce_mda(mda, max_size=max_size)
      return self._reduced
  
imports: from __future__ import division
  import copy
  import logging
  from datetime import timedelta
  import dask.array
  import numpy
  import xarray
  from pyresample import geometry
  import satpy.readers.utils
  from satpy._compat import cached_property
  from satpy.readers._geos_area import get_area_definition, get_area_extent, get_geos_area_naming
  from satpy.readers.eum_base import get_service_mode, recarray2dict, time_cds_short
  from satpy.readers.hrit_base import HRITFileHandler, ancillary_text, annotation_header, base_hdr_map, image_data_function
  from satpy.readers.seviri_base import CHANNEL_NAMES, HRV_NUM_COLUMNS, REPEAT_CYCLE_DURATION, SATNUM, NoValidOrbitParams, OrbitPolynomialFinder, SEVIRICalibrationHandler, add_scanline_acq_time, create_coef_dict, get_cds_time, get_satpos, mask_bad_quality, pad_data_horizontally, round_nom_time
  from satpy.readers.seviri_l1b_native_hdr import hrit_epilogue, hrit_prologue, impf_configuration
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 2 for calling the HRITMSGPrologueEpilogueBase obj's underlying member method code with example usage: obj._reduce(mda, max_size) and returns: self