XIM_STR_CONVERSION_REPLY message is strange

Hello,

I have a question about XIM_STR_CONVERSION_REPLY message.
On XIM spec, XIM_STR_CONVERSION_REPLY is defined as:

    2  CARD16            input-method-ID
    2  CARD16            input-context-ID
    4  CARD32            XIMStringConversionFeedback
       XIMSTRCONVTEXT    XIMStringConversionText

but xfree86 source does not conform to this.
xc/lib/X11/imCallbk.c:394 is :

        _XimSetHeader((XPointer)buf, XIM_STR_CONVERSION_REPLY, 0, &buf_len);
        buf_len -= XIM_HEADER_SIZE; /* added by _XimSetHeader (HACK) */
        p = XIM_HEADER_SIZE;
        *(CARD16*)&buf[p] = (CARD16)im->private.proto.imid; p += sz_CARD16;
        *(CARD16*)&buf[p] = (CARD16)ic->private.proto.icid; p += sz_CARD16;
        *(CARD16*)&buf[p] = (CARD16)cbrec.text->length; p += sz_CARD16;
        ~~~~~~~~~~~~~~~~~
               +----> this is not XIMStringConversionFeedback

        memcpy(&buf[p],&cbrec.text->string.mbs,length_in_bytes);
        p += length_in_bytes;
        *(CARD16*)&buf[p] = (CARD16)(sz_CARD32*cbrec.text->length);
        p += XIM_PAD(2);
        for (i = 0; i < (int)cbrec.text->length; i++) {
            *(CARD32*)&buf[p] = (CARD32)cbrec.text->feedback[i];
            p += sz_CARD32;
        }

On the other hand, IMdkit comform to XIM spec, it define structure for 
XIM_STR_CONVERSION_REPLY as:

xim_externaldef XimFrameRec str_conversion_reply_fr[] =
{
    _FRAME(BIT16),              /* input-method-ID */
    _FRAME(BIT16),              /* input-context-ID */
    _FRAME(BIT32),              /* XIMStringConversionFeedback */
    _FRAME(BIT16),              /* length of the retrieved string */
    _FRAME(BARRAY),             /* retrieved string */
    _PAD4(2),
    _BYTE_COUNTER(BIT16, 2),    /* number of feedback array */
    _PAD4(1),
    _FRAME(ITER),               /* feedback array */
    _FRAME(BIT32),
    _FRAME(EOL),
};

Which is right?