mapnik error. New in OpenStreetMap

Hi,

I'm new using OpenStreetMap and I can't obtein a render map :(

I downloaded only my country: spain.osm I'm working on Windows System and mi configuration es:

PostgresSQL + PosGIS + osmosis

Using osmosis I have be able to import de spain.osm into the data base.

Looking in the wiki for how to configure the Mapnik for render I am using the python solution using xml file.

;** part of the xml file

<Datasource>
  <Parameter name="type">postgis</Parameter>
  <Parameter name="host">localhost</Parameter>
  <Parameter name="dbname">osm</Parameter>
  <Parameter name="user">postgres</Parameter>
  <Parameter name="password">admin</Parameter>
  <Parameter name="table">(select ST_Buffer(ST_Centroid(geometry),2) as geometry, name  from world_worldborders) as world</Parameter>
  <Parameter name="extimate_extent">false</Parameter>
  <Parameter name="extent">-180,-90,180,89.99</Parameter>
</Datasource>

;***

test python file ;*

from mapnik import *

mapfile = 'test2.xml'
map_output = 'mymap.png'
m = Map(4*1024,4*1024)
load_map(m, mapfile)

bbox=(Envelope( 36.4817,-6.245,36.4518,-6.1443 ))

m.zoom_to_box(bbox)
print "Scale = " , m.scale()
render_to_file(m, map_output)

;**

When I launch the script I have the issue that world_worldborders table are not in the data base

Searching for the wiki I found that we need to incorporated in the tables the shp files: - 10m-populated-place - 110m-admin-0-boundary-lines - processed_p - shoreline_300 - world_boundaries-spherical

After insert then using the "PostGIS shapefile and DBF loader", I launch again the python script and I have the following error on the screen:

"not relationship for world_worldborders"

What do I need to do for making work this?

Thanks in advance, Manolo