What is subwiki

I recently started using tiddlywiki-app. Its documentation mentions support for Sub-Wiki, which sounds interesting and potentially useful.

I have several older wiki folders that I’d like to reorganize, so I’m trying to understand how this feature works.

What exactly is a Sub-Wiki?
I checked the official documentation and also searched this Discourse forum, but I couldn’t find a clear explanation.

Could someone provide a brief description or point me to the right resource?
Or general suggestions regarding managing several wiki folders separately and jointly?

Found some hints here TiddlyWiki App: A Smooth User Experience (2025) for Multiple Platforms - #45 by oeyoews

I remember that the subwiki concept first appeared in TidGi-Desktop. It was designed to add a private folder for users. Even if the HTML is exported, the content in the private folder will not appear in it.
The usage is to add a private tag to a tiddler(in tiddlywiki-app)

If you use tiddlywiki on top of the node server it is possible to generate additional wikis under the same node instance. The previously published Bob Wiki allowed you to create “sub wikis” from the master wiki and navigate to them from a list. Perhaps this is what was meant on tiddlywiki-app, but the term “sub wiki” is free and open to be defined by the reader/writer.

Arguably the following could also be sub wikis

  • Wikis generated using the inner wiki plugin
  • Wikis accessed through an iframe
  • Wikis with a subset of plugins and tiddlers from which you import content to be included in master or parent wiki

etc…