#### 29.2.4 Specifying heading levels for trails of links

You can specify the range of heading levels to include in trails of links. The following settings determine the level at which each trail starts and the lowest level where it can end. If headings at a given level are missing from a DITA file, that level is skipped when trails are constructed.

    [Trails]
    ; Trail*Level = heading level number
    TrailFirstLevel=1
    TrailLastLevel=9

Normally you would not want trails displayed for headings that do not start new HTML pages, so you would set TrailLastLevel to the lowest heading level that actually does start a new page.

You can use the [TrailLevels] section to assign a level in the trail to each heading paragraph format. Absent this section, DITA2Go uses the levels specified in [HelpContentsLevels]. For example:

    [TrailLevels]
    ; paraformat = level, from 1 to 9, or 0 to exclude from trails
    ChapTitle=1
    Heading1=2
    Heading1NoNum=2
    Heading2=3

To exclude a heading format from the trail, you can assign level 0 to that format.

To include a non-heading format as the current (last) item at any level in the trail, you can assign level 9 to that format. For example, if you assign the [HTMLParaStyles]Trail property to a paragraph format such as a figure caption that is not part of the hierarchy of headings, and can therefore appear at any level, assign level 9 to that format.

Previous Topic: 29.2.3 Specifying what to include in trails of links

Next Topic: 29.2.5 Specifying where to display trails of links

Parent Topic: 29.2 Generating trails of links

Sibling Topics:

29.2.1 Understanding trails of links

29.2.2 Specifying whether to include trails of links

29.2.3 Specifying what to include in trails of links

29.2.5 Specifying where to display trails of links