On grammatical class:

rai'o
Quote conversion: the quotation as presented uses pro-sumti and pro-bridi as if the current utterer (not the original utterer) were saying it, but the meaning conveyed is identical to that of the actual quotation by the original utterer and there is a claim that this meaning was expressed elsewhere
zai'u
Quote conversion: the sentence(s)/bridi (possibly plural) is/are syntactically correct and semantically intended by the utterer if the outermost layer of quotes (markers) which immediately follows were to be omitted/removed, but the quoted text is in fact a quote (of the indicated type) from some source.