/// <summary>
 /// Create an OpenXML SDK SpreadsheetDocument object from a
 /// docx4j SpreadsheetMLPackage
 /// </summary>
 /// <param name="xlsxPkg"></param>
 /// <param name="isEditable"></param>
 /// <param name="openSettings"></param>
 /// <returns></returns>
 public static SpreadsheetDocument createPresentationDocument(
     SpreadsheetMLPackage xlsxPkg, 
     bool isEditable, OpenSettings openSettings)
 {
     return SpreadsheetDocument.Open(
         new MemoryStream(SaveFromJavaUtils.toBytes(xlsxPkg)), 
         isEditable, openSettings);
 }
 /// <summary>
 /// Create an OpenXML SDK SpreadsheetDocument object from a
 /// docx4j SpreadsheetMLPackage
 /// </summary>
 /// <param name="xlsxPkg"></param>
 /// <param name="isEditable"></param>
 /// <returns></returns>
 public static SpreadsheetDocument createPresentationDocument(
     SpreadsheetMLPackage xlsxPkg,
     bool isEditable)
 {
     return createPresentationDocument(xlsxPkg, isEditable, new OpenSettings());
 }