Organizing and structuring navigation links in DITA XML is essential for creating an effective and user-friendly documentation experience. There are conventions and best practices that can help you organize and structure your navigation links efficiently. Here’s how it can be done:

1. Use a Navigation Container: It’s a common convention to use a container element, such as <nav> or <div>, to group your navigation links. This helps in styling and organizing your navigation elements. Here’s an example:

<nav>
  <ul>
    <li><a href="#section-1">Section 1</a></li>
    <li><a href="#section-2">Section 2</a></li>
  </ul>
</nav>

2. Semantic HTML Structure: To create structured navigation links, use semantic HTML elements like <ul> and <li> for unordered lists. This helps create hierarchical navigation menus. For example:

<nav>
  <ul>
    <li><a href="#section-1">Section 1</a></li>
    <li><a href="#section-2">Section 2</a></li>
    <li>
      <a href="#section-3">Section 3</a>
      <ul>
        <li><a href="#section-3-1">Subsection 1</a></li>
        <li><a href="#section-3-2">Subsection 2</a></li>
      </ul>
    </li>
  </ul>

3. Use IDs for Sections: Link to specific sections within your DITA topics by using the href attribute with the corresponding section’s ID. Make sure each section has a unique ID to ensure accurate linking. For example:

<section id="section-1">
  <title>Section 1</title>
  <p>Content of Section 1.</p>
</section>

By following these conventions, you can effectively organize and structure navigation links in your DITA documentation, making it easy for users to navigate and access content.