[Fontconfig] How to delete "ja" lang from a specific font?

[Funda Wang]

> Then something like <rejectfont>?
<fontconfig>
    <selectfont>
        <rejectfont>
            <pattern>
                 <patelt name="family"><string>WenQuanYi Zen
Hei</string></patelt>
                 <patelt name="lang"><string>jp</string></patelt>
            </pattern>
        </rejectfont>
    </selectfont>
</fontconfig>

But i don't know if it will work.
>
>>
>> ---
>> Kenichi Handa
>> handa at ni.aist.go.jp
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>>
>