20.3.2.5 Overriding default title text for a local-TOC entry
Local-TOC links are plain text. By default, the title of the referenced subordinate file becomes the text of each local-TOC link, minus any formatting, embedded links, in-line graphics, and so forth. You can override the default, if you must have formatting in the local-TOC link text, or if you want some other content for the link.
To override the default local-TOC link text, place a custom LocalTOCTitle marker in the first paragraph (usually a heading) of the subordinate file, and provide alternate text as the marker content.
See §29.2 Adding custom marker types.
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