_workbookRecordList = workbookRecordList;
_definedNames = new ArrayList<NameRecord>();
_externalBookBlocks = new ExternalBookBlock[] {
new ExternalBookBlock(numberOfSheets),
};
_externSheetRecord = new ExternSheetRecord();
_recordCount = 2;
// tell _workbookRecordList about the 2 new records
SupBookRecord supbook = _externalBookBlocks[0].getExternalBookRecord();