xsl fo Hyphenation - language property issue

Hello,

Can anyone tell me if this is this valid ... 
<fo:block hyphenate="true" language="none">some
text</fo:block>

Can I have language="none" ?

Well I tried this, I get this error....
[ERROR] if property 'hyphenate' is used, a language
must be specified

But W3C spec says we can use "none" 
http://www.w3.org/TR/2000/CR-xsl-20001121/slice7.html#common-hyphenation-properties

Can anyone clarify please.

I am using apache fop processor.

Thanks.
Mark

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