RE: [plcs-dex] Implementer guidance

["Mike Ward" <mike.ward@eurostep.com>]

I tend to agree with Dave here.  

Another (albeit minor) consideration is that P28 data files can simply miss
out the elements corresponding to OPT attributes and the distinction between
/IGNORE and $ provides a handy way of reconciling p21 and p28 files.

Mike

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Dr Mike Ward
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All,

Specifying /IGNORE is not useful to a post-processor at all as the attribute
value will never be read. Any DEX-based post-processor reading the file will
know to use Reference Data, not the explicit attribute. So, you should
simply leave it as $ as that takes less space and does not require the
pre-processor to set a value for every attribute replaced by the use of
Reference Data which can add noticable costs for very large datasets.

Cheers,
David

--------- Original Message --------
From: nigel.shaw@eurostep.com
To: plcs-dex@lists.oasis-open.org <plcs-dex@lists.oasis-open.org>
Subject: RE: [plcs-dex] Implementer guidance
Date: 16/01/06 09:07

>
> There are multiple possible interpretation of &quot;$&quot; whilst 
> /IGNORE
has a
> defined meaning. Therefore send &quot;/IGNORE&quot; would be my
preference.
>
> As examples, &quot;$&quot; can be interpreted as &quot;there is no
value&quot;, &quot;I do not know
> the value&quot;, &quot;I know the value but do not want to tell 
> you&quot;,
&quot;you are not
> allowed to know the value&quot;,...
>
> 	Nigel
>
>
>
> -----Original Message-----
> From: Barker, Sean (UK) [mailto:sean.barker@baesystems.com]
> Sent: 16 January 2006 08:47
> To: plcs-dex@lists.oasis-open.org
> Subject: [plcs-dex] Implementer guidance
>
>
>
> I am resolving an issue on the implementer guidance for /IGNORE.
>
>  Attribute values are set to '/IGNORE' when the information that could 
> be held by the attribute will be instead assigned to the instance of 
> the entity. Note: required attributes will always have an equivalent 
> assigned, whereas optional attributes need not be assigned.
>
> While this describes how to populate instance diagrams, the question
arises,
> what happens in the physical file. That is, should an unpopulated 
> optional attribute contain the value &quot;$&quot; or 
> &quot;/IGNORE&quot;?
>
>
> Sean Barker
> 0117 302 8184
>
>
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