Migrating from Joomla 1.5 to Joomla 2.5
From Joomla! Documentation
The "J2.5" namespace is a namespace scheduled to be archived. This page contains information for a Joomla! version which is no longer supported. It exists only as a historical reference, it will not be improved and its content may be incomplete and/or contain broken links.
This page has been archived.
This page no longer contains information relevant or current. It also contain information which is historical.