csup to svn

[Fbsd8]

snip
>>
>> csup has category called "base" that checkouts all the pieces parts
>> making up the ports "make" environment. IE Files in /usr/ports directory
>>
>> svn has no category called "base"
>>
>> What is base called in svn category?
>>
>>
> 
> svn co svn://svn.freebsd.org/base/release/8.3.0 /usr/src
> 
> for example.
> 
> To see the various branches, go to the svnweb site. 
> <http://svnweb.freebsd.org/>
> 
> In general, the checkout command will pull whatever you ask for and put 
> it where you tell it to and save date in a .svn directory which then 
> allows you to run svn up from then on (unless you delete the .svn 
> directory structure) to upgrade your sources.
> 

The base you have referenced in svn means kernel source.
The ports cvup has category named base.

There is no category named "base" in the svn ports category list.

Doing a cvup for category "base" builds the following
# /usr/ports >ls
.cvsignore      GIDs            LEGAL           Mk              Tools
CHANGES         KNOBS           MOVED           README          UIDs
COPYRIGHT       LASTCOMMIT.txt  Makefile        Templates       UPDATING

How do I do same thing using svn?