Here are some minor errors in Docbook XSL TCG, fourth edition.
The address to the SF account registration page is https://sourceforge.net/account/registration/
(as of 2008-07-12).
2. http://www.sagehill.net/docbookxsl/ToolsSetup.html#Validation (page 14)
"For example, xsltproc includes a program called xmllint...".
This is not correct: xmllint is not part of xsltproc; it comes with the libxml2 library.
3. http://www.sagehill.net/docbookxsl/InstallingAProcessor.html (pages 24, 25, 26)
Replace "xalan25.jar" with "xalan27.jar".
4. http://www.sagehill.net/docbookxsl/SpecialChars.html#MissingChars (page 331)
"Most XSLT processors do not do full validation, but they do load the entities defined in the DTD."
http://www.sagehill.net/docbookxsl/ToolsSetup.html#Validation (page 13)
"Most XSL processors won't automatically take the time to validate your document while it is converting it to HTML or XSL-FO".
Both these sentences are a little misleading: the XML parser does the validation and loading of entities.
5. http://www.sagehill.net/docbookxsl/OtherOutputForms.html#XhtmlXsltproc (page 409)
"The head element includes an XHTML namespace declaration"
Wrong: it is the "html" element that has the namespace declaration.