lutra@lutra-laptop:~$ apt-cache search python2.3-xml
python2.3 - An interactive high-level object-oriented language (version 2.3)
lutra@lutra-laptop:~$ sudo apt-get install zope3
Reading package lists... Done
Building dependency tree... Done
The following extra packages will be installed:
  python-docutils python-roman python2.4-clientform python2.4-docutils
  python2.4-mechanize python2.4-pullparser python2.4-twisted-bin
  python2.4-twisted-conch python2.4-twisted-core python2.4-twisted-web2
  python2.4-tz python2.4-zopeinterface zope-common
Suggested packages:
  python2.4-qt3 twisted-doc python2.4-profiler
The following NEW packages will be installed
  python-docutils python-roman python2.4-clientform python2.4-docutils
  python2.4-mechanize python2.4-pullparser python2.4-twisted-bin
  python2.4-twisted-conch python2.4-twisted-core python2.4-twisted-web2
  python2.4-tz python2.4-zopeinterface zope-common zope3
0 upgraded, 14 newly installed, 0 to remove and 0 not upgraded.
Need to get 6780kB of archives.
After unpacking 43.1MB of additional disk space will be used.
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