in between drafts 06 and 07 the following:

enum layoutreturn_type4 {
        LAYOUTRETURN_FILE = 1,
        LAYOUTRETURN_FSID = 2,
        LAYOUTRETURN_ALL  = 3
};

struct layoutreturn_file4 {
        offset4         lrf_offset;
        length4         lrf_length;
};


union layoutreturn4 switch(layoutreturn_type4 returntype) {
        case LAYOUTRETURN_FILE:
                layoutreturn_file4      lr_layout;
        default:
                void;
};


Definitions are missing from the LAYOUTRETURN 
operation definition.

Part of the dot-x rework for building the documents
is the source of the problem; just add it back in...