Daffodil gave me this error message: [error] Schema Definition Error: Referenced group definition not found: hidden-DISUSED_1 Schema context: GroupRefFactory Location line 31 in J3_0.dfdl.xsd
The first line makes sense and is easy to understand. The "GroupRefFactory" thingy makes zero sense. Why are you telling me about some internal thingy? I recommend removing that word.
