Is "lang" attribute of a response data fixed value ?

Hi there,

I requested follow URL.(modify apykey=my_key_value for example)
http://spotlight.reuters.com/api/feed/us/channelarticles/newsOne/json?ap...
I could get a json format response. and "lang" attribute was "en".

-- DATA Sample --
handleReutersJson({
....
"items": [
{
....
"body": {
"type": "html",
"lang": "en",

-----------------

When I requested follow URL for japanese text, "lang" attribute was "en".
I seem this value mean language type. so "lang" attribute should set "ja".
Is "lang" attribute of a response data fixed value ?

http://spotlight.reuters.com/api/feed/jp/channelarticles/topNews/json?ap...

Thanks,