Make <track> @type optional
The attribute <track>@type
shall become optional.
Links:
- Minutes ETCS use case working group meeting 18.10.2021: [https://www.railml.org/en/event-reader/railml-is-etcs-telco-2021-10-18.html]
- Forum discussion:
- Christian Rahmig, 17.01.2022: [https://www.railml.org/forum/index.php?t=msg&goto=2880&#msg_2880]
- Git issues:
- Wiki documentation:
- IS:track: [https://wiki3.railml.org/wiki/IS:track]