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Re: Gen2 ideas

From: <Daniel.DW.Wilms@bmw.de>
Date: Wed, 15 May 2019 07:29:34 +0000
To: <rstreif@partner.jaguarlandrover.com>, <mfeuer1@jaguarlandrover.com>, <ulf.bjorkengren@volvocars.com>, <public-automotive@w3.org>
Message-ID: <A650B6F9-7BB1-49A0-815D-E901C904EF98@bmw.de>
Hi,

> Array data type: Like Magnus, I am not entirely convinced of the "elements" property.
> It might be for backwards compatibility but if "value" now in general is expressed as an
> array that would not help much. An array is not a data type on its own as it holds multiple
> elements of a certain data type. Maybe "value" should be in general treated as an array of
> the data type but the server could unpack it automatically if there is only one element in
> the array e.g. instead of returning [5], it returns 5.
After the discussion we had yesterday, I’d say the extensions [1] could serve exactly this purpose.

Best,
Daniel


  1.  https://github.com/GENIVI/vehicle_signal_specification/issues/81


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From: Rudolf Streif <rstreif@partner.jaguarlandrover.com>
Date: Tuesday, 14. May 2019 at 22:16
To: Magnus Feuer <mfeuer1@jaguarlandrover.com>, "Björkengren, Ulf" <ulf.bjorkengren@volvocars.com>, public-automotive <public-automotive@w3.org>
Subject: Re: Gen2 ideas
Resent-From: <public-automotive@w3.org>
Resent-Date: Tuesday, 14. May 2019 at 22:15

Hi Ulf,

Thanks for thinking about the next step.

I like your proposal. In regards to the slides:


  *   WS/http access restriction: I think that's a good idea. I second it.
  *   Access restriction tagging of resources: That is a good idea too.

     *   I would call the property "access" considering that the settings are "none", "write", "readwrite".
     *   I am missing "readonly" for the "access" property.
     *   For attributes which are readonly by default erroneous settings need to be addressed e.g. write or readwrite on an attribute is not allowed.
     *   Not sure why for branches the property would need to be called differently ("restricted-default"). Why wouldn't it just be "restricted" (or "access" according to my proposal)?
     *   To clarify:

        *   The branch setting would only apply if there is no explicit setting for a leaf.
        *   For branches inside of a branch aka a child-branch, the child-branch setting overrides the parent branch unless the child-branch does not specify it.

     *   Access restriction properties could be provided by OEMs in form of overlays.
     *   Probably need to call out the implicit access defaults for the different element types:

        *   Attribute: read-only
        *   Sensor: read-only
        *   Actuator: write-only
        *   Branch: none
        *   RBranch: none

  *   Array data type: Like Magnus, I am not entirely convinced of the "elements" property. It might be for backwards compatibility but if "value" now in general is expressed as an array that would not help much. An array is not a data type on its own as it holds multiple elements of a certain data type. Maybe "value" should be in general treated as an array of the data type but the server could unpack it automatically if there is only one element in the array e.g. instead of returning [5], it returns 5.
:rjs
________________________________
From: Magnus Feuer <mfeuer1@jaguarlandrover.com>
Sent: Tuesday, May 14, 2019 9:50 AM
To: Björkengren, Ulf; public-automotive
Subject: Re: Gen2 ideas


I like it.



Is there a reason for having a specified element count explicitly called out?



I can understand a max_elements count to put an upper limit on the array size, but the implementation will surely be able to figure out the number of elements that are currently stored in an array?



Regards,



/Magnus F.
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From: Björkengren, Ulf <ulf.bjorkengren@volvocars.com>
Sent: Tuesday, May 14, 2019 5:32:38 AM
To: public-automotive
Subject: Gen2 ideas


BR

Ulf



Ulf Björkengren Ph. D.

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Received on Wednesday, 15 May 2019 08:17:36 UTC

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