| Re: [railml3.1] Make @applicationDirection optional [message #2126 is a reply to message #2061] |
Tue, 29 January 2019 16:03  |
christian.rahmig
Messages: 436
Registered: January 2016
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Senior Member |
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Dear Thomas,
dear all,
Am 29.12.2018 um 00:36 schrieb Thomas Nygreen:
> [...]
> In the 3.1-RC @applicationDirection is required for both
> <spotLocation>s and <linearLocation>s. Consequently it is
> not possible to position an infrastructure element without
> including @applicationDirection, even if most element types
> do not have any specific direction (see
> https://www.railml.org/forum/index.php?t=msg&th=607,
> including
> https://www.railml.org/forum/index.php?t=msg&th=607& goto=1985&#msg_1985).
> I fear that this will lead to the same confusion that exists
> in 2.x.
>
> The problem can be reduced by making the attribute optional,
> although this would still allow misuse (which is better than
> forcing it). I would prefer an alternate implementation that
> also separated elements that need a direction from the ones
> that do not, but I acknowledge that it would go against the
> general design. (After all, one is free to choose any
> location type for any element.)
The railML 3.1 implementation considers your remarks and makes the
attribute @applicationDirection optional (see Trac ticket #266 [1]). By
doing so, a missing attribute @applicationDirection may either mean,
that the infrastructure element has no application direction or that it
is unknown. Consequently, the attribute @applicationDirection has to be
provided whenever the direction is known (no default value).
> As a side note: so far, the documentation of this attribute
> and its values is scarce. This increases my fear that this
> attribute will be misinterpreted and misused.
Thank you for your hint. In order not to forget about this issue, I
moved the Trac ticket #266 [1] into the Wiki domain.
[1] https://trac.railml.org/ticket/266
Best regards
Christian
--
Christian Rahmig - Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Phone Coordinator: +49 173 2714509; railML.org: +49 351 47582911
Altplauen 19h; 01187 Dresden; Germany www.railml.org
Christian Rahmig – Infrastructure scheme coordinator
railML.org (Registry of Associations: VR 5750)
Altplauen 19h; 01187 Dresden; Germany www.railML.org
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