Hash the entries in file1 by their English term. Then iterate over the entries in file2, insert or update each entry based on its existence in the hash.

You haven't provided the full XML, so I had to wrap each file into <root>...</root> in order to be able to play with them. I named the first file 1.xml and the second one 2.xml . I then implemented the logic in XML::XSH2: 

my $file2 := open 2.xml ;
open 1.xml ;
my $t := hash langSet[@xml:lang='EN']/tig/term /root/termEntry ;

for my $entry in $file2/root/termEntry {
    my $entry1 = xsh:lookup('t', $entry/langSet[@xml:lang='EN']/tig/te
+rm) ;
    if ($entry1) {
        for my $lang in $entry/langSet/@xml:lang {
            if (0 = count($entry1/langSet[@xml:lang=$lang]))
                cp $lang/.. into $entry1 ;
        }
    } else {
        cp $entry into /root ;
    }
}

save :b ;

[download]

BTW, I had to remove the </termEntry> before <langSet xml:lang="FR"> in the expected output, I hope that's what you meant.

($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: Updating XML files by choroba
in thread Updating XML files by Anonymous Monk

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