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At run time, the BizTalk Orchestration Engine executes XLANG/s files that are produced by BizTalk Orchestration Designer. Orchestration Designer is a rich graphical tool for visually designing business processes. It generates XLANG/s files that have an .odx extension and contain additional visualization information in their headers and custom attribute information in their bodies.
Note
XLANG/s can be viewed as a messaging language with some of the expression capabilities of C#.
The primary functions of the orchestration engine are:
Persistence
Hosting the .NET components
Transactions
Large message support
Runtime validation
Load throttling
BizTalk Server Architecture
XLANG-s Language
Optimizing Resource Usage Through Host Throttling
How BizTalk Server Processes Large Messages