Formatting Object namespace URI

I feel like I must be missing simething really obvious, but in the
4-21-1999 XSL draft I can't find the URI that should be used for the fo:
prefix. Is it http://www.w3.org/TR/WD-xsl/FO as in the previous draft?
or http://www.w3.org/XSL/Format/1.0 for similarity with XSLT? or
something else?


+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo@xxxxxxxxxxxxxxx | Writer/Programmer |
+-----------------------+------------------------+-------------------+ 
|               Java I/O (O'Reilly & Associates, 1999)               |
|            http://metalab.unc.edu/javafaq/books/javaio/            |
|   http://www.amazon.com/exec/obidos/ISBN=1565924851/cafeaulaitA/   |
+----------------------------------+---------------------------------+
|  Read Cafe au Lait for Java News:  http://metalab.unc.edu/javafaq/ | 
|  Read Cafe con Leche for XML News: http://metalab.unc.edu/xml/     |
+----------------------------------+---------------------------------+


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list