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.
A "mustUnderstand" attribute -if set to true- says that the SOAP header it's part of must be understood by the actor handler which tries to handle it. If it's named "MustUnderstand" then it wouldn't be understood (because case matters in XML).