wp_link_pages() output concept - wordpress

<ul class="post-pagination" id="custom-id">
    <li class="first-pagination-element">
        <a>Previous Page</a>
    </li>
    <li>
        <a>1</a>
    </li>
    <li class="current-pagination-element">
        2
    </li>
    <li>
        <a>3</a>
    </li>
    <li class="last-pagination-element">
        <a>Next Page</a>
    </li>
</ul>