On Oct 23, 2006, at 1:11 AM, Mike Schinkel wrote:
Let me go ahead and give you a hypothetical example (I have had the
exact
problem in the past, so it is a real problem, it's just that explain in
hypotheical requires less background explanation):
http://www.wiki-info.org/platforms/linux/php/
http://www.software-info.org/wikis/platforms/linux/php/
Both those URLs are different and have different "bread crumbs" but
otherwise the same content. Search engines do not *know* they are the
same,
but may determine they are similar enough that it will only include
one of
the URLs in it's index (Google frequently did this to us at VBxtras &
Xtras.Net back when there were two sites.) However, the search
engines may
choose to include the page from "software-info.org" when I'd rather
have him
include the page from "wiki-info.org" or vice-versa. So, I would like
to be
able to define in the "software-info.org" page that the wiki-info.org
page
is "content-duplicate" and "authoritative" over the existing page.
Microformats seem perfect for this, but I can see where website owners
may
not want to make this type of information visible.
So, what if your take on this problem and use-case?
The existing HTML semantic for this is rel="alternate" to say that the
page is an alternative for the current one. The existing semantic
rel="bookmark" says that the link is the one to keep - 'permalink' in
blog parlance.
So in http://www.software-info.org/wikis/platforms/linux/php/ insert:
<a href="http://www.wiki-info.org/platforms/linux/php/"; rel="alternate
bookmark">Definitive link for this page</a>
and on http://www.wiki-info.org/platforms/linux/php/ insert:
<a href="http://www.software-info.org/wikis/platforms/linux/php/";
rel="alternate">Alternative link for this page</a>
A possibly better way to do this would be to redirect at the HTTP
level, so http://www.software-info.org/wikis/platforms/ returns a 301
redirect to http://www.wiki-info.org/platforms/linux/php/
The other pre-existing rel value worth considering is XFN's rel="me",
as a way of asserting the pages are alternative representations of the
same thing, but this is really only meant for a page used as a proxy
for a person.
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