I have a GUI Extension adding a Tab (ext:tabpage) to View.
What does the ext:pagetype node do? I have been using Namespace:Name like the following. Are there other options for the value?
<ext:pagetype>RC.TabExtension</ext:pagetype>
It allows you to have a specific JavaScript implementation for that tab.
If you specify the full name of a JavaScript class and it implements the Tridion.Controls.DeckPage
interface, it will use that implementation for the tab.
If it's not a class or it doesn't implement the interface, it will just use the default implementation.
(Tabs inherit from Decks, in case you are wondering)