x1 is a word which is a {cmevla} (morphological name-word), referring to x2 and used by x3, and which is also of the form of a lujvo (excepting the last rafsi) formed from veljvo x4, in language x5
See also: jvocme (closely related but sort of opposite), cmevla (a different generalization), jvosmicme (a different generalization), and jvocmevla (which is essentially the same except slightly narrower in assumptions and terbri).