ExportPackage exportPackage =
ExportPackageForPDX.createExportPackageForPDX("name_of_exp_package", "description",
"author", genIds, genParams);

PDXExportHelper.doExportToPDX(sourceContainer,(ExportPackageForPDX)exportPackage,
PDXExportHandler.XML_ATTR_ATTACHMENTS_OPTION, dir, "zipName");