2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/172946Probably building non procedural languages is the most prospective way for parallel programming just because non procedural means no fixed way for execution. The article consists of 3 parts. In first part we consider formal systems for definition a named datasets and studying an expression power of different subclasses. In the second part we consider a complexity of algorithms of building sets by the definitions. In third part we consider a fullness and flexibility of the class of program based data set definitions.20 pages, will be printed in "Programming" magazine of RASDistributed, Parallel, and Cluster Computingtext