Just for comparison, the same task in xsh, a wrapper around XML::LibXML: 
open 1155670.xml ;
for /shipment/box xmove packing/slip replace . ;
xinsert attribute '_TYPE="produce"' into /shipment/slip ;
for /shipment/slip[not(following::node()[1][self::text()])]
    xinsert text {"\n  "} after . ;
save :b ;

[download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

[download]

In reply to Re: Moving elements with XML::Twig: Document root closing tag is duplicated on output by choroba
in thread [SOLVED] Moving elements with XML::Twig: Document root closing tag is duplicated on output by ateague

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