Customizing indexes for specific output channels is a valuable capability in DITA publishing. It allows you to tailor the indexing structure and content to meet the unique requirements and expectations of different output formats, ensuring that your documentation is optimized for each channel.

PDF Index

For a PDF output channel, you may want to create a traditional alphabetical index that lists keywords or topics along with page numbers. This index can be generated at the end of the document, providing a handy reference for users who prefer printed or downloadable documentation. Here’s an example of how you can define a customized PDF index in DITA:

<index type="pdf">
  <entry>
    <term>Installation Guide</term>
    <page>5</page>
  </entry>
  <entry>
    <term>User Manual</term>
    <page>15</page>
  </entry>
  <entry>
    <term>Troubleshooting</term>
    <page>30</page>
  </entry>
</index>

Web Help Index

Conversely, for web help output, you might prefer a more interactive approach, such as enabling search bars, auto-suggest functionality, and contextual links. These features enhance the user experience in an online environment, making it easier for users to quickly find the information they need. Here’s an example of how you can define a customized web help index in DITA:

<index type="web-help">
  <search-bar>enabled</search-bar>
  <auto-suggest>enabled</auto-suggest>
  <contextual-links>enabled</contextual-links>
</index>

By customizing indexes for specific output channels, you can optimize user navigation and accessibility, ensuring that your documentation is user-friendly and well-suited to the intended medium.