* who they trust (/repute/certify etc)
* in what WAY they trust them (I certify this person as a friend/i certify this person as a trustworthy person to do business with/i certify this person as someone who knows a lot about ancient history, etc)
* and how MUCH they trust them.
In addition, each document cites a URI that specifies the "reputation type", which means that context of social norms/internet standards in which the document is meant to be interpreted. Each different "reputation type" is in essence its own internet standard.
I am not aware of any other generic distributed reputation list document standard proposals, but I don't know much about this stuff so please tell me if you know of any. Two proposed extensions to FOAF that cover atomic certifications (not lists of certifications) are 1 and 2.
The idea is that once people put up documents like this, others will be able to spider them, just as "social search engines" can spider FOAF files now.
more details on the "reputation budget" proposal at CommunityWiki
What do you think?