This standard BS ISO/IEC 13250-5:2015 Information technology. Topic Maps is classified in these ICS categories:
35.240.30 IT applications in information, documentation and publishing
This part of ISO/IEC 13250 specifies a formal model for subject maps, minimal access functionality and information retrieval from subject maps and a constraint framework governing the interpretation of subject maps.
Particular formalisms to constrain subject maps are not covered by this part of ISO/IEC 13250.