To Whoever This Concerns, I have downloaded SGML Version 3.1 of DocBook. I am compiling it in Softquad Author/Editor using Rulesbuilder. The compiling works without any problems but when I try to use compiled version I get the message Error in Document Type Declaration in the document: Character is of the wrong type. ' (34) is not a minimum data character. I get this message when I compile on the PC and also on UNIX. Can someone point out the problem so I can fix it. I have used the Declaration that was supplied in the ZIP archive for Version 3.1 Your help is greatly appreciated. Denny Miller SGML/XML Specialist PRDGROUP Inc. 210-234 York Street York, PA 17403