| [railML3] Proposing new @epsgCode for <geometricPositioningSystem> [message #3898] |
Tue, 17 February 2026 11:38  |
Marharyta Vyskarka
Messages: 23
Registered: April 2025
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Junior Member |
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Hello everyone,
We have been taking an extensive look at the attributes related to the reference systems. It was noticed that there are multiple such attributes between railML 2 and 3. For example, railML 2 has <geoCoord>/@epsgCode [1], railML 3 has @srsName (in such elements: <lineString> [2], <posList> [3],<point> [4], <pos> [5]) and <geometricPositioningSystem>/@crsDefinition [6].
It is also worth to note that the mentioned attributes have different types of data (xs:anyURI and xs:string), which doesn't put many restrictions on the expected data. Both of these options allow such values as "4326", "EPSG:4326", "urn:ogc:def:crs:EPSG::4326", "urn:ogc:def:crs:EPSG:9.8.7:4326", "https://www.opengis.net/def/crs/EPSG/0/4326".
To bring more clarity and to be consistent we wanted to propose replacing @crsDefinition [6] by a new attribute @epsgCode (xs:int) in railML 3.4. This proposal is based on the idea that the EPSG code was intended by the previous crsDefinition, and that making it just a code instead of a relative URI would make it more uniform, removing ambiguity. I also want to note that @srsName would stay the same, as it is part of GML, and we cannot change it.
Therefore I want to ask, does anyone use anything else other than EPSG for @crsDefinition? Are there any other concerns regarding such change?
[1] https://wiki2.railml.org/wiki/IS:geoCoord
[2] https://wiki3.railml.org/wiki/IS:lineString
[3] https://wiki3.railml.org/wiki/GML4RAILML:posList
[4] https://wiki3.railml.org/wiki/IS:point
[5] https://wiki3.railml.org/wiki/GML4RAILML:pos
[6] https://wiki3.railml.org/wiki/RTM:geometricPositioningSystem
Best regards,
Margo Vyskarka
Marharyta Vyskarka – Software Developer
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org
[Updated on: Thu, 26 February 2026 17:33] Report message to a moderator |
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