olemus
ISO/IEC 2382:
programmi süntaktiliselt lubatav osa, mille võib moodustada ühest või mitmest lekseemist vastavalt mingi programmikeele reeglitele
= a syntactically allowable part of a program that may be formed from one or more lexical tokens in accordance with the rules of a programming language

ülevaateid
https://en.wikipedia.org/wiki/Language_construct

https://cronfa.swan.ac.uk/Record/cronfa58598/Download/58598__21548__6a4a461690a04afda43900da9ba1a3ce.pdf