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	Thu, 16 Jul 2015 14:01:57 -0700 (PDT)
Date:	Fri, 17 Jul 2015 00:01:54 +0300
From:	"Vladimir Zhbanov (vzhbanov AT gmail 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>
Subject:	Re: [geda-user] Difference between attached and detached attributes
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On Thu, Jul 16, 2015 at 01:27:33PM -0700, Girvin R. Herr (gherr375 AT sbcglobal DOT net) [via geda-user AT delorie DOT com] wrote:
> Greetings,
> I have been doing some symbol work in gschem and I got confused again about
> attached attributes vs detached attributes.  The manuals do not go into
> detail about usage.  Hint, hint.  Can someone tell me what is the difference
> between them and where I should apply one vs the other?
> 
I believe nothing changed since the creation of this document:
  http://wiki.geda-project.org/geda:master_attributes_list

I don't see any ambiguous statements there.

> Right now, I am using attached attributes for everything except the pin
> attributes in my symbols. But the fact that there is that detached option
Brrr,
pin attributes must be attached to their pins,
general symbol attributes must be detached/floating in the symbol

> there makes me wonder if I am using the correct type.  In other words, what
> is detached used for?  Then there is the "attribute promotion" issue.  Is

What is the issue with promotion?

> there any impact on attribute promotion when using one or the other?
Detached/floating attributes are promoted when the symbol is
instantiated.

> Any other "gotchas" when using one or the other?
> Is there any problem with changing the attribute value after symbol
> instantiation from one or the other?

The floating attribute value within the symbol can be thought of as the
default. If you remove a promoted attribute of an instance of the symbol
then this value will be used. Otherwise nothing changes.

HTH,
  Vladimit

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