>>273
I personally attach UI to either the "fu'e" or the "fu'o" and intend for that to mean either way that the UI is attached to what's inside. I hope that's what other people mean by that too. :)
Discursives and evidentials are also in selma'o (se cmavo) UI, so they act exactly the same as ".ui". You can say for instance: "mi djica lo nu fu'e pe'a mi citka lo xirma fu'o" (I want to "eat a horse", so to speak.) The "fu'e/fu'o" is used to show that "pe'a" (a member of UI) attaches to everything inside the parentheses ("mi citka lo xirma").
Vocatives can be placed inside fu'e/fu'o, but it doesn't do anything special to them. The vocative will still address the bridi, IOW, not just what's in the parentheses. (You can however separately address to/toi parentheticals! That's a different matter.) For instance you could say: "mi klama fu'e .ui doi do fu'o" (I am going, and I'm happy it's you I'm telling.) The "doi do" still addresses the whole "klama" bridi, but the fu'e/fu'o can indicate that part of the sentence to show how you feel about it.
The most important thing to know about attitudinal parentheses, about fu'e/fu'o, is that they don't affect the grammar of the bridi. Other parentheses in Lojban don't work that way (the inside of to/toi is its own bubble-world) but with fu'e/fu'o you are just taking an existing bridi and hanging something off the side of it, bringing it up into a higher dimensionality! So you can take a bridi with some shape to it, like "mi nelci lo nu do klama le zarci" (I like that you go to the store), and put fu'e/fu'o anywhere you want, and it still works the same: "mi nelci fu'e lo nu do klama fu'o le zarci" or "mi fu'e nelci lo nu fu'o do klama le zarci" or "mi nelci lo fu'e nu do klama le fu'o zarci".. it does nothing to the grammar of the sentence, nothing at all, it just marks part of it so that you can separately decorate it.
Here's the relevant CLL section: http://jbotcan.org/cllc/c19/s8.html (I mildly disagree with its confusing statement that fu'o "cancels all in-force attitudinals", whatever that means.)
mu'o mi'e se ckiku