From a C # file directly, you cannot return to the XSD file (without using xsd.exe).
You can restore the circuit from the type created in the C # file:
xsd.exe yourdll.dll /t[ype]:TypeYouWantASchemaFor or
xsd.exe yourExe.exe /t[ype]:TypeYouWantASchemaFor
See "DLL and EXE File Settings" in the xsd documentation .
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