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Date:	Wed, 23 Dec 2015 00:44:35 +0000
Message-ID:	<CAJXU7q-4qZDRm8C8nntJ2UxGOFkybDBktCMbZpk76=-RiC_maQ@mail.gmail.com>
Subject:	Re: [geda-user] Prop ... Structure? (Clearance calculation)
From:	"Peter Clifton (petercjclifton AT googlemail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	gEDA User Mailing List <geda-user AT delorie DOT com>
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On 22 December 2015 at 22:02, Peter Clifton
<petercjclifton AT googlemail DOT com> wrote:
> For design intent, voltage is important - but ideally, specify it in a
> more semantic way.
>
> Aside: I could write voltage=250V with the correct AP210 primitives,
> but it would probably take a page worth of boilerplate to define the
> SI unit quantities, specify tolerances, define the property of the
> object, instancing an instance of the property, mapping it onto the
> object owning the property, assigning it a value etc...
> I'm mocking STEP and its complexity - this genuinely is an almost fair
> representation of how it defines properties... but there is a reason
> why they do it this way. (Not entirely sure I know the reason though
> ;)).

And for amusement - on STEP properties, I found this link:

http://www.wikistep.org/index.php/PDM-UG:_Properties_Associated_with_Product_Data

That site is a nice resource on some aspects of STEP, and the PDM
schema is both interesting, and simultaneously, all the boiler-platey
nonsense you get annoyed at having to push out just to complete a
valid AP203 or AP214 file with a bit of geometry in it. (You have to
give a full grounding and context, including "product information" -
to attach the geometry to.. - the geometry definition is a
"representation" of the "shape aspect" of the product IIRC - been a
while now.)

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