How to Display a Topic Before the Table of Contents
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To display a topic before the table-of-contents page, follow these steps:
  1. Make sure the topic is referenced on the first level in the DITA map.
  2. Set the @outputclass to before-toc on the root element of the topic.
<topic id="MyTopic" outputclass="before-toc">

Result: When the PDF is processed, the topic will automatically appear before the table of contents.