inline-graphic

I am using 
<fo:block>
<fo:inline-graphic href="file:logoitau.gif"/>
</fo:block> 
to insert an illustration in my pdf, but not this
working, the cocoon accuses the following error:
"Unknown formatting object
http://www.w3.org/1999/XSL/Format^inline-graphic". 
What should make?, thank you.

=====
========================
Elisio Menegueli Pereira
epereira@xxxxxxxxxxxxxxx
========================

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