复制XML文件，保留某些元素的结束标记

I'm hacking a thing that should copy an XML file and edit little part of it. Editing now is OK, but interestingly enough copying may be quite tricky. This is essentially «reverse engineering» work and now I know that I should somehow preserve closing tags of some elements (even if the elements contain only white space or are empty). The problem is when HXT reads something likeI'm hacking a thing that should copy an XML fil