Developing the new 2025 SRSTI master version: Upgrading and updating the rubricator’s reference tools

The authors discuss the results of the development of the new master version of the State Rubricator of Sci-tech Information (SRSTI, GRNTI) in part of updating and upgrading polyhierarchical links between the ubject headings and developing the rubricator’s reference apparatus. New links between subject headings are established in SRSTI classification schedule to reflect the types of subject belonging to different thematic classes and subclasses in various structural locations; reference notes are updated to reveal and specify their subject contents; information on subject heading data maintenance is provided. In total, 1,211 changes are made to the current SRSTI version reference apparatus, including 921 new polyhierarchical links and 43 notes; 133 links and 4 notes removed, information on 99 links and 11 notes updated. Significantly, the link “see also” is the main type of new polyhierarchical links between the subject headings with the 65% share. This evidences on the increasing interdisciplinary component within the SRTSTI structure. The developed reference apparatus of SRTSTI 2025 master version supports the deeper structuring of polyhierarchical links between subject headings and the more clear delineation of their thematic aspects which increases the quality of indexing information resources with relevant subject headings.