Biztalk Schema Question:

Each message in BizTalk Server is considered a multi-part message and is made up of zero or more parts. Each message with one or more parts has one of these parts identified as the body part. Each part consists of a binary chunk of data which can represent an XML document, a flat file, a serialized .NET class, or other binary stream of data. You use the body part of the message to identify the type of the message that can be used for routing.