| Re: [railML3]: Proposed semantic constrain for TvdSection [message #3476 is a reply to message #3453] |
Thu, 20 February 2025 14:27   |
Thomas Nygreen
Messages: 89
Registered: March 2008
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Dear Jörg,
These are syntactic, not semantic, constraints. Also, it does not guarantee that the TVD section has a well-defined closed area. For instance, if there is a switch inside the TVD section, it would need (at least) three demarcating elements. (At least) four if it has a crossing. The demarcating elements still also have to be placed in a certain manner. We could instead add a constraint that there should be no path out of the TVD section that does not lead to a demarcating element, but it would be quite complex to validate.
Best regards,
Thomas
Thomas Nygreen – Common Schema Coordinator
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org
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