object of SpatialPolygonsDataFrame from several objects of the class

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Dear R-users,

I am trying to built a shp file of the class SpatialPolygonsDataFrame 
using several shps. After handling the objects, I have 20 objects of the 
class SpatialPolygonsDataFrame (some are SpatialPolygons only) and I 
want to built one object (one shp) that is the result of gathering all 
shps but conserving the borders (that is, I cannot use 
unionSpatialPolygons). I want to plot the final objetc in a given order, 
so that if I am able to convert it in a spatialpolygondataframe, I guess 
I can use slot(globalshp,"plotOrder").
No, avoid using internal slots unless you know what you are doing. See 
spRbind() methods in maptools, and use it sequentially, after making sure 
that the row.names() of the objects to be combined are not duplicated 
(they must be unique in the combined object).

Hope this helps,

Roger

Thanks a lot in advance,

Berta

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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no