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hstore is a postgresql module, which is used optionally by newer versions of xowiki and xowf (xowiki content flow ). The supporting functions (creating indices, etc) are currently mostly in in xowf but will be moved eventually into xowiki.
Under Ubuntu, you can install it by locating the appropriate sql file on your system (you may need to install the postgres-contrib first), and then install it as postgresql user via:
psql -d <yourdb> -f /usr/share/postgresql/8.3/contrib/hstore.sql
You can then verify the successful installation on the shell using:
::xo::db::has_hstore