Naming conventions - What are allowed names for namespace and folders in Joomla?

[astridx]

I have a problem with a view name. I like to use FOOPlaces.
The view is not found using this name.

After I renamed view-folder and namespace to Fooplaces everything works fine.

I found this site.
https://docs.joomla.org/J4.x:File_Structure_and_Naming_Conventions

According to this site the foldername for the template should use lower case.

What are allowed names for namespace and folders in Joomla?

[Fedik]

If you have a view FOOPlaces, then:
File to the view class: patch_to_component/View/FOOPlaces/HtmlView.php
Full class name with namsepace (for Site): Astridx\Component\MyCoolComponent\Site\View\FOOPlaces\HtmlView
And tmpl file: patch_to_component/tmpl/fooplaces/default.php

Can use Content Article view as example components/com_content/src/View/Article/HtmlView.php

UPD:

After I renamed view-folder and namespace to Fooplaces everything works fine.

Ah, maybe that because in URL it willl be view=fooplaces, and so you can use only Fooplaces.
Yeah, looks like a litle limitation.