This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
I find it very odd that a DTD declaration would point to a schema. Very odd indeed. I would expect it to point to a valid DTD. Apparently the parser agrees with me. You might consider reporting that to the people who support the product.