In BizTalk Server development, understanding how the engine identifies a message is crucial. Many developers mistakenly believe that the physical filename (e.g., MySchema.xsd) defines the schema’s identity. This is incorrect.
The Formula for Identity
BizTalk defines the unique MessageType of a schema using a simple combination:
- Target Namespace # Root Node Name
For example, if your:
- namespace is http://SandroPereira.com/Orders.
- And your root node is PurchaseOrder.
Then the MessageType is: http://SandroPereira.com/Orders#PurchaseOrder
In other words, BizTalk uses this combination to identify and resolve schema references. Then… changing the filename of a schema does not make a new BizTalk schema!!
📝 One-Minute Brief
BizTalk Server identifies messages using a unique MessageType derived from the combination of Target Namespace#Root Node Name. A common misconception is that changing a schema’s filename creates a new identity; it does not. To create a unique schema identity or differentiate between similar schemas, you must modify either the namespace or the root node name within the schema editor.
You could modify the schema namespace or the name of the root node in order to enable BizTalk to differentiate among the remaining schemas.
Always remember: BizTalk ignores the .xsd filename for resolution. It only cares about what is inside.
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