When reading about semantic web, I always feel that the authoring part is ignored. In a distributed environment, statements about facts have no meaning if it is

When reading about semantic web, I always feel that the authoring part is ignored. In a distributed environment, statements about facts have no meaning if it is not possible to trace the source of the fact. So, each piece of data should be versioned and be signed by an author (which could also be an organisation) and if based on other sources, have links to those sources, such that it is possible to verify the correctness of the aggregrated fact.