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Re: [railML3] New semantic constraint restricting RTM:level, IS:netElement and IS:netRelation [message #4054 is a reply to message #3997] Thu, 18 June 2026 13:36 Go to previous messageGo to previous message
Larissa Zhuchyi is currently offline  Larissa Zhuchyi
Messages: 113
Registered: November 2022
Senior Member
Dear all

To ensure readability of railML files coordinators approved sematic constraints given below on 2026-05-18. They are filed as IS:025 and IS:026 at https://wiki3.railml.org/wiki/Dev:SemanticConstraints.

IS:025: Each <netElement> must belong to exactly one <level>.

IS:026: Each <netRelation> must belong to exactly one <level>.

This follows existing practice of railML partners e.g. Hacon, Trafikverket and SBB.

Additionally, railML.org suggests introducing yet another semantic constraint:

IS:029: Each netRelation must reference netElements of the same level of aggregation.

Please let us know your doubts until 2026-07-21.

Sincerely,

Larissa Zhuchyi – Ontology Researcher
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org

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