Online DTD Validators

I had been creating some DTDs for a book that I am currently writing. The book is not about DTD. The title of the book is "XSD For SQL Server 2005 Developers" and it aims at helping SQL Server 2005 developers to make effective use of XML SCHEMA COLLECTIONS and TYPED XML. Though the book is on XSD, I have a few paragraphs that talk about DTDs. I had been creating some code samples to demonstrate in the book and wanted to have a quick way to validate the DTDs that I created.

After searching for a while, I came up with over a dozen web pages which validates an XML document against a DTD. Unfortunately, most of them were taking a URL as input and validates the doucument pointed by the URL. My case was different. I wanted to have a page that validates direct input text. I found a few validators that do this.

http://www.stg.brown.edu/service/xmlvalid/

http://www.xml.com/pub/a/tools/ruwf/check.html

http://validator.w3.org/#validate_by_input