If a xs:choice is nested in a xs:sequence running the generated code throws an exception like:
Type of choice identifier 'Items1ElementName' is inconsistent with type of 'Items1'. Please use array of System.Collections.Generic.List ...
This error was raised and described in http://xsd2code.codeplex.com/discussions/48138
but no real solution was provided in any of the discussion threads as replacing the List by an array causes another error (at least in NET 4): Unable to generate a temporary class (result=1). error CS1061: 'System.Collections.Generic.List<namespace.FlexPropType>' does not contain a definition for 'Length' and no extension method 'Length' accepting a first argument of type 'System.Collections.Generic.List<namespace.FlexPropType>' could be found (are you missing a using directive or an assembly reference?) (this error is described at http://stackoverflow.com/questions/6866301
So maybe a modification in the Xsd2Code code template could solve this issue.