[xsl] entities in decimal-format/format-number

Hi,

I have a problem with formatting numbers in xslt1 (libxslt).

I'm trying to use custom grouping separator. And sometimes it works.
<xsl:decimal-format name="foo" grouping-separator="&#160;"/>
...
<xsl:value-of select="format-number(21031036025.8, '#&#160;###','foo')"/>

But when I use some other entities, it doesn't:
<xsl:decimal-format name="foo" grouping-separator="&#8201;"/>
...
<xsl:value-of select="format-number(21031036025.8, '#&#8201;###','foo')"/>
(8201 is thin space)

And I can't figure out why it doesn't sometimes.
Thanks in advance for any help.

Mike.

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