Allow enum at @trainUsage of <category> to be extendable
The enum values of the attribute @trainUsage of shall be allowed to be extended.
Discussion in forum: https://www.railml.org/forum/index.php?t=msg&th=689&start=0&
The enum values of the attribute @trainUsage of shall be allowed to be extended.
Discussion in forum: https://www.railml.org/forum/index.php?t=msg&th=689&start=0&
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