Axel Boldt wrote:
Generally, when adding GFDL material, we have always added a line at the bottom saying "An earlier version of this article was based on bla bla by bla bla" and a link back to the original material.
Is this sufficient? Isn't it also the case that all future modifications must be submitted back to the original source? I'm asking because I don't know these details of FDL.
I see two different cases: Copying from an FDL source to a static web page is different from copying from an FDL source to a Wiki. In the latter case, it is so much more natural that any edits stay at the Wiki (whether this is Wikipedia to which text is copied, or another Wiki that copies information from Wikipedia, e.g. Sevilla).
(A Wiki works like a "modification magnet" or a "modification black hole", where modifications are likely to stay and not get out. Printed paper editions are the opposite: A teflon surface where no modifications stick. It is like we are beginning to understand the forces of attraction and repellation, just like static electricity 200 years ago, but this time we're discovering the natural laws for what drives people to contribute voluntary intellectual work. The Internet plays the role of Volta's battery.)