| Re: Extension suggestion for alternativeSectionTT [message #2479 is a reply to message #2391] |
Wed, 01 July 2020 15:14   |
Torben Brand
Messages: 158
Registered: March 2016
|
Senior Member |
|
|
Dear Dirk and TT development group,
I will explain our UC in more detail for better understanding. We want to describe the n alternate path(s) of a train. With the path we mean the route of the train/ the way along the network (also as explained in this forum posting: https://www.railml.org/forum/index.php?t=msg&th=710& start=0&). The alternative path(s) is only "minor" different to the primary path in relation to run time calculation. Usually (secondary) track 2 instead of (main) track 1 on a crossing loop. So that different arrival/departure/run times can be neglected. We would also primarily use the feature in trainParts forming the extension nor:patternTrains (norwegian extension documented on www.jernbanedirektoratet.no/railML)), that do not have any times (do not use <times>).
As we are also concerned with "uncontrolled growth" we think that the solution suggested by Milan is the easiest (increase the multiplicity/cardinality to "n" and add @priority to <sectionTT> in railML 2.5. This would bloat the xml way less than having to create a new copy of the trainPart and train with only minor changes to the orriginal.
We could also not use the attribute @scope today as it only allows a "secondary" path and not "n" paths.
We welcome a discussion about the correct use of train@scope as we know it has been used somewhat differently as described in the wiki/in this forum posting. We think that the correct focus here is, as described in the wiki, is the train@scope is a separate slot allocation (DE:Trasse). For the solution with alternative sectionTTs this is within the same slot (order/allocation).
To describe it in a different (and maybe more precise way). alternativeSectionTT has the same order of OCPs (as it only has one trainpart). Different to train@scope which has different ocps, or a shorter length of ocps between the two alternative trains/trainparts.
[Updated on: Thu, 02 July 2020 10:36] Report message to a moderator |
|
|
|
Members
Search
Help
Login
Home
