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<?xml version="1.0" standalone="no"?>
<!DOCTYPE datacapture SYSTEM "datacapture5.0.dtd">
...

    </ruleset>
</data-capture-requirements>

$VAR1 = {
    'Foo' => {
...
        'C' => {},
    }
};

sub returnRecordHeadings {
    my ( $self, $xml ) = @_;
...
    }

} # End Sub