http://msdn.microsoft.com/en-us/library/aa559637.aspx
MSDN上关于这个特定的权威解释.
http://www.microsoft.com/downloads/details.aspx?FamilyID=02c5fd53-fee9-44fc-a780-5d1d34ee8754&displaylang=en
文档,包含一个实际的例子和解释.
http://msdn.microsoft.com/en-us/library/bb851740.aspx
http://www.richardhallgren.com/a-pattern-for-ordered-delivery-using-orchestrations/
