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From: "karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] [announcement] pcb-4.3.0 released
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Comments: In-reply-to "Bert Timmerman (bert DOT timmerman AT xs4all DOT nl) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
   message dated "Mon, 01 Mar 2021 19:57:24 +0100."
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Bert:
...
> This is considered a feature release as the footprint file format now 
> allows for stating the pad center and length, width parameters.

The doc is a little thin on the details:

$ git diff -r c2b7b595deded3219a0a -r c7dcafdeed2484ca4ea7fdd doc/pcb.texi 
diff --git a/doc/pcb.texi b/doc/pcb.texi
index 61bc4d62..e13c5a28 100644
--- a/doc/pcb.texi
+++ b/doc/pcb.texi
@@ -4362,6 +4362,11 @@ the masks used in board manufacturing.  In fact, older mask making
 equipment created lines in precisely this fashion.  A physical aperture was
 used to pass light through onto a photosensitive film.
 
+There is an alternate representation of the pad - a pad can be specified as
+coordinates of its centerpoint and pad size. The pad is internally stored
+in traditional format. This format significantly simplifies the manual design
+of elements.
+
 @node Layout File
 @section Layout File Format
 @cindex layout files, format of