| Re: Steckenunterbruch/line blocking [message #501 is a reply to message #500] |
Wed, 05 December 2012 20:55   |
Dirk Bräuer
Messages: 311
Registered: August 2008
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Senior Member |
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> for getting a connection to another forum, it is better to use the
> followup-tag.
I don't know what a follow-up tag is.
> Your idea limits the blocking to tracks
That was my intention. The original question was on blocking of lines
only. I do not want to solve problems we don't have now.
Some days ago, somebody wrote
> we will focus on the main aspects only.
> However, since the "disabled" sub-element will be available for all
> relevant tracks, there is no need to define a length of the blocking
> section in form of a "from-to" attribute group.
But then there would be no possibility do "block a part of an <element>"
such as part of a track (sub-section of a track). In the world of
timetabling, we do normally not always know the exact elements which are
disabled or which are the reasons for a blocking.
A typical problem (to solve here) is "line/track is blocked from ... to
...." with from/to being mileages or stations. Since trains can operate
between stations only, the only relevant aspect for timetabling is between
which stations a track is closed.
Anyway, I think we have two very different views of the problem with each
one being entitled. So I do not want to say that a possibility to declare
any infrastructure element as disabled wouldn't be useful. But currently,
the problem was something else on the much less detailed level of
timetabling.
> Here, I suggest to just implement a reference from the <disabled>
> element to an operating period.
Such a reference would - as far as I know - the first time we would create
such a "forward-reference". Forward in the meaning of "from infrastructure
to timetable". We already have many references from timetable to
infrastructure which are "natural" since one _first_ needs infrastructure
_before_ one can operate a train.
To have both directions, I would think is like "circular references" which
sometimes can become problematic in informatics. In my opinion, a software
first has to import <infrastructure> before it can import <timetable>. So
it wouldn't be able to dissolve the references from infrastructure to
timetable when importing.
But this is my opinion only.
Dirk.
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