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Time Relations of Infrastructure and External References via <any> Attribute [message #1612] Tue, 20 June 2017 10:27 Go to next message
Tobias Bregulla is currently offline  Tobias Bregulla
Messages: 1
Registered: June 2017
Junior Member
Dear railML infrastructure community,

our software GPSinfradat is an integrated hard- and software solution for GNSS- and video based infrastructure survey of railways. This hardware is combined by a tailor-made software suite from an in-house development with a certified railML 2.2 and 2.3 export interface.

For our application we are currently missing a central aspect in the model: the time. In particular, we want to specify for each infrastructure element the time when it has been recorded by our system and the relation to the corresponding video picture. Although this seems to be a very specific problem, it relates to a more generic topic to be discussed: the introduction of a more complex time dimension model within railML®.

Therefore, we propose having a generic solution, which can be adopted by other applications / use cases, too. We currently can formulate the following requirements for our application:
- Recording of time with millisecond accuracy
- Absolute time stamps following the UTC time
- Relative time in form of seconds since start of recording

The following reduced example of a signal shows how we imagine to see it implemented in railML:
<signal id="si01" >
    <times>
       <time id="si01_t01" date="2017-05-24" utcTime="09:30:10.320Z" relTime="32.812"  type="survey" gpsinfradat:SurveyRefID="c134f4a0-6085-48f4-a3e4-79daa2305e78">
    </times>
</signal>

The type shall be used to define different kinds of timestamps, e.g. "validFrom", "validTo", "updated", "modified" etc. The time values itself can be of type xs:date (date), xs:time (utcTime) and xs:nonNegativeInteger (relTime).

@railML community:
  • Do you have similar requirements?
  • Do you have any special constraints how to model time aspects?
  • Do you know about other types of modelling (OpenStreetMap or others)?
Further, we would like to reference an external data source with our recordings. In particular, it should be possible to reference a video file with the <track> element. Though we think that this is a very specific request to be most probably realized in a schema extension, we want to share our proposal with you:
<track id="tr01" ... >
    <trackTopology>
       ...
    </trackTopology>
    <gpsinfradat:survey id=c134f4a0-6085-48f4-a3e4-79daa2305e78 startTime="2017-05-30T09:30:10.320Z">
       <gpsinfradat:video id=ad0c3743-281d-44ee-97ec-24778981967b type="front" fileRef="\customer\project\video01.mp4"/>
       <gpsinfradat:gnss id=bd0c3743-281d-44ee-97ec-24778981967b type="rawSatellite" fileRef="\customer\project\video01.gnssraw"/>
       <gpsinfradat:video id=42b739b7-1176-4681-b940-994bb9a77038 type="front" fileRef="\customer\project\video01.mp4"/>
       <gpsinfradat:gnss id=4916e3bd-5568-40a0-9cb6-5a2926c1eb30 type="matched" fileRef="\customer\project\video01.gnsscrypt"/>
    </gpsinfradat:survey>
</track>

@railML community:
  • Does anyone have similar requirements?
  • Are there other members in the railML community who used the terms
    above in another meaning?
  • Whats your opinion about shortening of tags ("videoRef" instead "videoReference") in the railML syntax?

Best regards,

Tobias Bregulla
Bahnkonzept Dresden/Germany

[Updated on: Tue, 20 June 2017 10:51] by Moderator

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Re: Time Relations of Infrastructure and External References via <any> Attribute [message #1620 is a reply to message #1612] Mon, 03 July 2017 17:52 Go to previous message
christian.rahmig is currently offline  christian.rahmig
Messages: 46
Registered: January 2016
Member
Dear Tobias,

thank you very much for your feedback and welcome to our railML community!

Short answer on your questions:

Am 20.06.2017 um 10:27 schrieb Tobias Bregulla:
> [...]
>
> For our application we are currently missing a central aspect in the
> model: the time. In particular, we want to specify for each
> infrastructure element the time when it has been recorded by our system
> and the relation to the corresponding video picture. Although this seems
> to be a very specific problem, it relates to a more generic topic to be
> discussed: the introduction of a more complex time dimension model
> within railML.

The topic is currently under discussion at the RTM Expert Group. We will
keep you up to date regarding any changes or approaches. As indicated,
major changes will be only implemented with railML v3. For railML v2,
please use the existing elements/attributes or make use of an own extension.


> [...]
> Further, we would like to reference an external data source with our
> recordings. In particular, it should be possible to reference a video
> file with the <track> element. Though we think that this is a very
> specific request to be most probably realized in a schema extension, we
> want to share our proposal with you:
> [...]

Sounds interesting. Currently, I do not know anybody else having these
requirements or application. Therefore, please feel free to go on with
your proposed solution!

Best regards
Christian Rahmig

--
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
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