Keep a stack of tagnames around. This will even work if things are nested. (Of course, if the file is in bad shape, you'll have to go through by hand, but that's the case anyway.) Pseudo-code: 
# find something like @interface
push @stack, 'interface';
# parse lines until reaching a closing curly
my $tagname = pop @stack;
print "</$tagname>";

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In reply to Re: How do I replace brackets with XML tags? by chromatic
in thread How do I replace brackets with XML tags? by Anonymous Monk

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