Thank you very much Don!! It works well. I am happy.

I just added the argument 1 with the cloneNode function to get the child nodes.

$descr->addSibling($elt->cloneNode(1))
[download]

You are right, <fixe> is not the root element of the file. I should have mentioned that.

by the way, when I remove some nodes and then when I use toString or serialize, the xml is not really pretty. Is there a function to remove unneeded \n and to format the output with the good indentation? (a kind of "pretty print" with xmlspy for those who know this software)

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