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Re: SpeedChange : Protection system reference [message #418 is a reply to message #416] Thu, 01 November 2012 16:40 Go to previous messageGo to previous message
Dirk Bräuer is currently offline  Dirk Bräuer
Messages: 311
Registered: August 2008
Senior Member
Dear all,

> Why not to define both references like already done with the
> <connection> elements? That can be easily assured by special
> constraints. Both sights meet their requirements.

I would agree with that suggestion - despite it is redundancy.

But if we create such a cross-reference here, we should also answer the
general question related with it:
- The redundancy which always lies in two cross-references has to be
accepted.
- Each reference in RailML which is so far a simple one - one direction
only - can be made to an optional cross-reference without discussion.

Is it possible to make cross-references optional in general? That means:
It is not necessary to give both directions. If both directions are given,
the special XML constrains secure that they there is no conflict between
them.

Best regards,
Dirk.

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