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Re: Introduction of speedChangeGroups required? [message #165 is a reply to message #164] Thu, 13 October 2005 13:49 Go to previous messageGo to previous message
Volker Knollmann is currently offline  Volker Knollmann
Messages: 32
Registered: October 2003
Member
On 10.10.2005 11:29, Matthias Hengartner wrote:
>> 2) How to keep comptability with the version 1.0? Should the old
>> <speedChange>-element be kept untouched?
>

> My original idea was to leave the original <speedChange>-element and add the
> <speedChangeGroup>-element as an additional possibility (similar to
> signal/balise groups).

Hmmm... two different elements for almost the same purpose?

> --> Where should we place the attribute "dir"? As an attribute of
> <speedChangeGroup> (as above) or as an attribute of the single
> <aSpeedChange>-elements?

That points me to a slightly more general question. Image the following
static speed profile for a train of an arbitrary train category:



^ v
|
|
| 80 km/h
+---------------------+
| |
| |
| | 40 km/h
| +----------------
|
|
|
+---------------------|-------------------------> s
s0

---> "up"-direction



Which railML-elements would you introduce at position s0?

A speed change to 40 km/h valid in up-direction?
Plus a speed change to 80 km/h in down-direction?

A speed change to 40 km/h with implicit assumption of a speed change to
80 km/h in opposite direction? (Attention: speed changes are often not
"symmetrically"!)

An extended <speedChange>-element with two v-attributes: vMaxUp,
vMaxDown? This would be incompatible to V1.0, btw!

Anything else?


The more I think about this example, the more I guess we need not only a
clear definition and documentation of the SYNTAX, but also of the
SEMANTICS...

What do you think?


Remember: Answers to this posting in German are as welcome as answers in
English! Don't hesitate to tell us your opinion!


Best regards,
Volker Knollmann

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