x1 is the ICAO (International Civil Aviation Organization; French: Organisation de l'aviation civile internationale, OACI) designation/result/standard/code for general subject type x2 (contextless default probably: airports) applied to specific case/entity/procedure/group/hub/terminus/location x3 according to rule/ICAO specification/publication x4 published by/according to mandating organization x5 (default: ICAO)
x1 need not be a name-designation/code (it could be the result of any rule), although it likely will commonly be so. Possible examples of x2-filling sumti include: certain (international) airport code designations, air navigation procedures, etc.. For an airport (generalized)/hub that has such a specification, use te jvinjica'o or te se jvinjica'o (using the appropriate terbri for specifying the type of hub: tebri j2); for ICAO, consider using xe jvinjica'o. See also: jviso, jvinjiata.