The <navtitle> element, as opposed to the @navtitle attribute, is supported in maps beginning with DITA version 1.2. To direct DITA2Go to look for <navtitle> elements instead of navtitle attributes in <topichead>s, to use for TOC entries:
[TopicHeads]
; TopicheadsHaveNavtitles = No (default, treat topicheads as
; topics only if they have a navtitle attribute, not element)
; or Yes (assume all topicheads have navtitles)
TopicheadsHaveNavtitles = Yes
To direct DITA2Go to treat the value of locktitle as “yes” when this attribute is missing:
[MapOptions]
; LockAllNavtitles = No (default, require @locktitle="yes" to
; use navtitles) or Yes (make missing @locktitle default to yes)
LockAllNavtitles = Yes
To include all topics in the TOC by default:
[MapOptions]
; UseAllInTOC = No (default, require @toc="yes" to put topic
; in TOC), or Yes (put all topics in TOC unless @toc="no")
UseAllInTOC = Yes
If you are producing a Help output type, also see §16.4.2 Including contents entries in HTML-based Help.