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<?xml version="1.0" encoding="utf-8"?>
<install type="module" version="1.0.0">
...
        <tab index="2">Assign</tab>
    </notebook_tabs>
</install>

use strict;
use warnings;
...
my $install = $t->root();
print "NAME: " . $install->first_child('name') . "\n";
}