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This XML
demonstrates how we could achieve this:

example.php
example

In instances where there are only two files, for example, the plugin file and an image,
it is common to name the image the same as the plugin element:

example.php
example.gif

Summary
Joomla! events are occurrences that trigger the event dispatcher to notify the relevant
listeners that an event has occurred. Listeners, in plugins, are classes and functions
that attach themselves to the global event dispatcher.
We put plugins into groups to increase the efficiency of plugins. The group imports
Plugins. Grouping events together means that we only need to import the relevant
plugins when we need them. Remember that we are not forced to use the existing
groups and that we can define as many new groups as we like.
In lieu of library extensions, we can manipulate plugins to behave like libraries.


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