Installer File Formats
Joomla! 1.5 introduced the concept of site and administrator languages enabling Joomla! to be fully translated and this was reflected in the language installer. Joomla! 1.5 also renamed 'mambots' to 'plugins', which has again been reflected in the installer file formats. Mambots and plugins should be interchangeable however the usage of 'mambot' as an install type has been deprecated and is not valid in the Joomla! 1.6 release.
The usage of "install" as the root tag has been deprecated in favour of "extension". This has been done to avoid conflicts with of tags in some formats as well as to better reflect the nature of the file format.
Joomla! 1.6 features a new trigger system for all extensions similar to the "installfile"/"uninstallfile" feature that components have in 1.0/1.5 releases. Triggers available include preflight, installer, update, postflight, uninstall.
Joomla! 1.6 deprecates the usage of "installfile" and "uninstallfile" tags in favour of the new "scriptfile" tag. Additional to this the "com_install" and "com_uninstall" methods are deprecated in favour of a installation class (e.g. ExtensionNameManifest).