[xsl] class and graphic in FO?

Just began to work on a project by using XSL-FO.  As
in html page, we can use CSS to define a class to
format a html page.  I am wondering how I can define a
class to do a similar trick b/c it is very cumbersome
for me to set the text formatting for every
<fo:block>.

Also, How can I display a picture in a PDF file? 
What's the syntax?

Thanks for any help and have a nice holiday.

Yan

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