code: function parse_PtgAttrSemi(blob, length, opts) {
  	var bitSemi = (blob[blob.l+1] & 0xFF) ? 1 : 0;
  	blob.l += opts && opts.biff == 2 ? 3 : 4;
  	return [bitSemi];
  }
docs: /* [MS-XLS] 2.5.198.37 ; [MS-XLSB] 2.5.97.29