for(int i=0;i<surfaceForm.length;i++) {
if (surfaceForm.bytes[i] == PAYLOAD_SEP) {
throw new IllegalArgumentException("surface form cannot contain unit separator character U+001F; this character is reserved");
}
}
output.writeShort((short) surfaceForm.length);
output.writeBytes(surfaceForm.bytes, surfaceForm.offset, surfaceForm.length);
output.writeBytes(payload.bytes, payload.offset, payload.length);
} else {
output.writeBytes(surfaceForm.bytes, surfaceForm.offset, surfaceForm.length);
}