XHTML output that will work as input to Confluence requires a different syntax for links, and several special settings. Thanks to research by Robert Lauriston, DITA2Go provides a way to produce the required markup. See:
https://confluence.atlassian.com/display/DOC/Confluence+Storage+Format
To direct DITA2Go to produce XHTML for Confluence 4.x:
[HTMLOptions]
; Confluence = No (default, use normal linking)
; or Yes (make Confluence links)
Confluence = Yes
When Confluence=Yes, DITA2Go automatically sets the options listed in Table 22-2. You can override these individually if necessary.
To configure Confluence links:
[HTMLOptions]
; ConfluenceLinks = No (default, use normal links)
; or Yes (use the link parts specified below)
ConfluenceLinks = Yes
; These are the default parts for Confluence links:
ConfluenceLinkStart = <ac:link>
ConfluenceLinkPage = <ri:page ri:content-title="
ConfluenceLinkPageEnd = "/>
ConfluenceLinkText = <ac:link-body>
ConfluenceLinkTextEnd = </ac:link-body>
ConfluenceLinkEnd = </ac:link>
When ConfluenceLinks=Yes, the remaining ConfluenceLink* settings are in effect.
Note: The XHTML files you produce with DITA2Go must be imported into Confluence one at a time. As of this writing, no batch import utility is available.