x1 (quoted text) is a fragment/incomplete statement/question/utterance/proposition/text with intended meaning x2 in the context/under conditions x3 (default: the currently relevant context)
Named reference. It converts a sumti into another sumti. The converted sumti points to the referent the name of which is the referent of the unconverted sumti.
x1 (lu; quote) is said/expressed by x2, followed by expression x3 (lu; quote), via expressive medium x4, and then continuing on/proceeding/serially resuming to express/say x5 (lu; quote), and then x6 (lu; quote), and then x7 (lu; quote), ... (open-ended terbri structure of arbitrarily many sumti slots).