The Wiki in Tiki offers you a way to dump the link structure of pages in the wiki, the dump will be a regular txt file with Unix line feeds where each line represents the link leaving a page. In order to get the link structure for the wiki you have to use the following URL:
NOTE (Sept. 6, 2016): This file is no longer included with Tiki.
This will produce an output similar to the following one:
Now what can you do with this? Well the most interesting use is feeding some utility with the "live" link structure of the Wiki to get a graphical representation of pages. You can build your own graphical rendering routine or application or use an existing utility such as the Touchgraph Wiki browser.