I realize I'm probably asking for someone to explain the equivalent of string theory to a high school freshman, but I'm struggling to understand how to modify the dita2htmlImpl.xsl file so that the transformed files I get from Oxygen tag the <task> and <concept> entries in my <composite> files are tagged as "H2" headings and not "H3" headings. Example of my composite topic file <?xml version='1.0' encoding='UTF-8'?> <!DOCTYPE dita PUBLIC "-//OASIS//DTD DITA Composite//EN" "http://docs.oasis-open.org/dita/v1.1/OS/dtd/ditabase.dtd"> <dita> <topic id="MyTopic"> <title>My Composite Topic</title> <prolog> <metadata> <othermeta content="en_US" name="language"/> <othermeta content="US" name="country"/> </metadata> </prolog> <body> <p>This is the general introduction to this concept and task.</p> </body> </topic> <concept id="concept1" conref="../../shared/en-us/concept1.dita#concept1A"> <title>Concept title</title> </concept> <task id="task1 conref="../../shared/en-us/taskt1.dita#task1A""> <title>Task title</title> </task> </dita> Assuming that this "works" in the transform, I get content where each concept and task comes in tagged as "H1" I need these to be tagged "H2" instead. I realize that I can use <section> tags to mark sections as subordinate, but the <composite> type doesn't seem to support <section> tags where I need them. Conceptually it would be like this: <section> <title>Major Concept</title> <concept id="concept1" conref="concept1.dita#concept"> <conbody/> </concept> </section> <section> <title>Major Task</title> <task id="task1" conref="task1.dita#task"> <taskbody/> </task> </section> but of course this doesn't work. Also, I would end up getting the Title from the Section as well as the Task or Concept. So, do I somehow munge the dita2htmlImpl.xsl file to somehow make Tasks and Concepts "H2" entries, or can I somehow get the idea of a subordinate Concept or Task into a Topic/Composite Topic DITA file?