You can also have multiple levels of namespaces.
You can do so since Tiki12 in one of the last screens of the Admin Wizard (see "Set up some advanced options" ), and you can set it up in the next screen ("Set up Namespace"). Or if you search for "Namespace" in tiki-admin.php (activate experimental preferences, as of Tiki12 )
The easiest way to take advantage of the Namespaces feature is to use it through the Workspaces UI feature, which will peform the hard work for you (objects, categories, permissions, perspectives, namespaces...).
Alternatively, you can create your wiki pages following common namespaces by hand (see below).
Create 2 pages with the following names and they will both be in the same abc namespace:
In Tiki, user pages follow the convention
Similar but different to namespaces, you can categorize pages in any number of categories. Whereas a page can only be in one namespace.
The easiest way to take advantage of the Namespaces feature is to use it through the Workspaces UI feature, which will peform the hard work for you, setting also the categories and perspectives that comply with the namespaces you chose for them.
The default ":_:" namespace separator will be urlencoded to "%3A_%3A" which is not really human readable. According to https://stackoverflow.com/questions/1856785/characters-allowed-in-a-ur