// add all entries from the incremental update.
List<COSWriterXRefEntry> xRefEntries2 = getXRefEntries();
for ( COSWriterXRefEntry cosWriterXRefEntry : xRefEntries2 )
{
pdfxRefStream.addEntry(cosWriterXRefEntry);
}
COSDictionary trailer = doc.getTrailer();
// trailer.setLong(COSName.PREV, hybridPrev == -1 ? prev : hybridPrev);
trailer.setLong(COSName.PREV, doc.getStartXref());