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Re: How to model 3 topology levels in rail.ML [message #2187 is a reply to message #2184] Fri, 03 May 2019 12:00 Go to previous messageGo to previous message
christian.rahmig is currently offline  christian.rahmig
Messages: 223
Registered: January 2016
Senior Member
Dear Thomas,

welcome to the railML forum!

Am 26.04.2019 um 12:19 schrieb Thomas Langkamm:
> [...] How could we model 3
> or more topology levels?

railML 3.x topology model is based on RailTopoModel and very generic in
application. This means that you can model as many topology levels as
you want. However, in discussion we came to the conclusion that three
levels are enough: micro, meso and macro.

> We create track plans with all details (microscopic rail.ML
> model), but we usually import our timetables from planning
> programs and need to match the data from the planning
> programs to our track plans. Many planning programs use a
> 2-tier topology: One that is based on stations, and one that
> is more detailed (but not as detailed as the microscopic
> topology), usually on basis of station tracks and possibly
> parking tracks. [...]

Micro topology level is used to model the track network in detail. The
timetable view on stations and lines can be modelled as macroscopic
topology. In between, you can define the mesoscopic topology, in which
you aggregate the line tracks to lines, but remain the station track
network. This way of aggregating is different to the approach used in
the Simple Example where the station tracks have been aggregated and the
line track remains. However, both approaches are possible from schema
point of view, because so far there is no exact definition of the terms
"micro", "meso" and "macro".

Nevertheless, there is an important rule to follow:
The aggregation of a more detailed topology level towards the more
aggregated topology level must be unambiguous in order to ensure
bi-directional level conversion. This is ensured with the
<elementCollection*> elements, which list the (detailed) elements
belonging to the (aggregated) element.

Does this answer help you for the moment?

@community: what do you think about the definition of the topology
levels "micro", "meso" and "macro"?

Best regards

Christian Rahmig - Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Phone Coordinator: +49 173 2714509; railML.org: +49 351 47582911
Altplauen 19h; 01187 Dresden; Germany www.railml.org
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