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A: You create a combined DFDL schema that accepts ANY of the message types, and distinguishes them by the type code. 

Caveat: For this to work, the schemas being combined must have target namespaces, and they all must be distinct target namespaces.

Issue:

Jira
server ASF JIRA serverId 5aa69414-a9e9-3523-82ec-879b028fb15b key DAFFODIL-2916

is a bug (in Daffodil 3.8.0 and prior) which, until fixed prevents combining from working for schemas with no namespace.  

Let's assume you have 3 different message types, A, B, and C. Each has a DFDL schema file a.dfdl.xsd, b.dfdl.xsd, and c.dfdl.xsd. 

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