1. Some explanations on DTD declarations: http://www.w3.org/QA/2002/04/valid-dtd-list.html

2. Why XHTML 1.0 Strict is not included in Visual Studio 2005/2008 [

http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=114516
http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=105583

](http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=114516)4. Proposed Solution: Include only HTML 4.01 Strict, Transitional, Frameset; XHTML 1.0 Strict, Transitional, Frameset; and XHTML 1.1 DTDs as defined by W3C at http://www.w3.org/QA/2002/04/valid-dtd-list.html

Scott G's Web log on HTML Validation  
[http://weblogs.asp.net/scottgu/archive/2005/11/23/431350.aspx](http://weblogs.asp.net/scottgu/archive/2005/11/23/431350.aspx)