SignedPing and Trackback/PingBack

-----Original Message-----
From: Bob Wyman [mailto:bobwymanpubsub.com] 
Sent: Friday, March 24, 2006 11:53 AM
Subject: SignedPing and Trackback/PingBack

Hans Granqvist wrote:
> I would be interested in hearing what your take is on
my
> write-up on the trackback <-> signed ping
relation: 
>http://signedping.com/wiki/index.php/Sign
ed_Ping#Relation_to_tracking_p
ings
	You seem to conclude that trackback != signedping. I
disagree.

	I believe that "trackback" is best performed by
simply pushing
an
atom entry to a trackback URL. (At least a minimal
<source/> element
should
be provided and a signature would be optional but
recommended.) Thus,
from a
specification point of view, the only thing that
distinguishes a "ping"
from
a "trackback" is the address to which it is
delivered and how it is
processed by the receiver. The actual Ping and trackback
payloads that
are
generated as the result of a single publishing event might
differ in
their
content; however, their specification would/should be
identical.
	If it is desirable to limit play-back then one could
include a
<link
rel="trackback-to" ..../> in the signed
content to indicate the target
URL
for the trackback. If one wishes to support user generated
"summaries"
of
original content, then the atom:summary field should be used
and
atom:content can be optionally omitted. If the intent is
only to do a
"pingback" without any content payload, then one
would simply exclude
both
atom:summary and atom:content but ensure that a minimal
<source/>
element is
provided. 
	Note: This use of atom entries to accomplish a more
flexible
Pingback/Trackback facility was one of the motivators for
the source
element
in atom.
	Given the above discussion, Trackback is simply a special
case
of
the more general case of pinging or "pushing"
content from one a
publisher
to a consumer/subscriber. As such, I would suggest that
there is a great
deal of overlap with pinging.

	bob wyman



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