docs: def is_sysmeta_pyxb(sysmeta_pyxb):
      """Args: sysmeta_pyxb: Object that may or may not be a SystemMetadata PyXB object.
  
      Returns:
        bool:
          - ``True`` if ``sysmeta_pyxb`` is a SystemMetadata PyXB object.
          - ``False`` if ``sysmeta_pyxb`` is not a PyXB object or is a PyXB object of a
            type other than SystemMetadata.
  
      """
      return (
          d1_common.type_conversions.is_pyxb_d1_type(sysmeta_pyxb)
          and d1_common.type_conversions.pyxb_get_type_name(sysmeta_pyxb)
          == 'SystemMetadata'
      )