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Re: [Social-discuss] Linking two FOAF user accounts together ( e.g. lib

From: Stéphane Corlosquet
Subject: Re: [Social-discuss] Linking two FOAF user accounts together ( e.g. + )
Date: Sun, 18 Jul 2010 12:18:30 -0400

Just to clarify, you need to make sure the resources you're linking with owl:sameAs are of type foaf:Agent (or foaf:Person). You shouldn't directly link foaf:OnlineAccount since these have clearly different properties, e.g. account creation date, user name, content created with this account, the site it is associated with. This applies to the owl:sameAs property which is well deployed and understood by semantic web tools. In the end, to put this in more human friendly form: it's like saying that 2 accounts are owned by the same person, as opposed to saying that the 2 accounts are the same.

Of course, end users won't have to worry about this subtlety and it's easy to built this in the system. You can easily do this by using hash URIs for your foaf:Agent aka WebID, that's what most people and systems do, timbl uses card#i, Drupal uses user/23#me, etc.


On Sat, Jul 17, 2010 at 6:57 PM, Melvin Carvalho <address@hidden> wrote:
The topic came up from mattl on IRC of linking two accounts together, say, for example on and

I discussed the FOAF perspective with timbl and it seems there is a relatively straightforward solution to this:

1a. In foaf is at ( say )
1b. In foaf is at ( say )

2. You just need a add a sameAs link between the two in your FOAF.

<> sameAs <>

And you're done. 

Web 3.0 enabled search engines, visualization tools (e.g. tabulator), and inferencers, should be able to understand this and make semantic inferences appropriately.  It also makes federated single sign more straightforward.

"a hub sort of hub approach" it was described by timbl ... hope that helps!

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