footer

If all rows in a column share the same value, e.g. first name, its recommended to place the value in a header or a footer.

    <table>
        <fields>diploma_id</fields>
        <footer>diploma_id</footer>

If you rename a field, use the renamed value for the footer

    <table>
        <fields>diploma_id as nr</fields>
        <header>nr</header>

If the data is of primary nature, you can use a header instead. Make sure the data is really unique, because the column will be hidden.

The first letter will be capitalized.

Use lowercase when possible