Several question on Formatting Objects

Hi
?
I'm using FOP, and I have a problem with
fo:display-graphic
It doesn't work.
Here is my syntax:
<fo:display-graphic href="url('caution.jpg')"/>
I have the same problem with fo:inline-graphic
?
What is the good FO in order to produce the same thing
of the
HTML tag <br/> inside a fo:block?
?
I want to make the same thing of CSS float. Is it
possible?
?
Why don't FOP recognise margin-* in a fo:block?
?
Is there other free XSL-FO processor(better than FOP)?
?
Thanks for your help.
Sydney, a french student

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