Hi.
Having been in filelist.sgml a bit recently I've noticed that the original alphabetical ordering of the entities therein hasn't been adhered to. Partly, I suspect, because there is no guidance about these files and how they are organized. The attached puts things back into alphabetical order (by section) and adds some commentary to this and related files, and the manual.
I made the choice to move the special %allfiles; reference to the top since placement doesn't matter and burying the one unique thing in the middle of the file didn't seem helpful. Now both its immediate presence and the comment point out the existence and purpose of ref/allfiles.sgml.
David J.