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Date: Tue, 15 Aug 2017 07:28:51 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] [pcb] mainline: redundant attributes: bug or
 feature?
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> I suspect my thoughts were this: the user API should require/expect
> unique keys (hence get-by-value) but the low level stuff should be able
> to preserve (erroneous) redundant keys when loading/saving a *.pcb file.
> Making load/store git friendly is a goal in pcb.

Attribute with same name added several times may in sort of be interpreted as a list of values. In gschem it is possible to add several attributes with same name but it never make sense and it's not possible to know for sure which value is used.