Is DocBook-xsl compatible with Ruby 1.9?

Hi, all:

I tried to install docbook-xsl from Ubuntu 9.10 repository.
But, it automatically pick up Ruby 1.8 to install.
I know that to install both Ruby 1.8 and 1.9 is of no problem.
However, I'm just wondering 

1) Is current docbook-xsl compatible with ruby 1.9 ?
2) If so, does that mean it's Ubuntu's problem that docbook-xsl ask for Ruby 1.8 but not Ruby 1.9?

I just want to keep every simple and clean.

Just don't want to install Ruby 1.8 on my computer.

Best Regards
JIA

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