Hal terpenting untuk suatu komponen di Joomla adalah memiliki file XML yang menentukan bagaimana komponen tersebut harus diintegrasikan ke dalam sang CMS. Sebagai contoh, anggaplah kita akan membuat sebuah komponen Joomla bernama “coba” yang berfungsi untuk menampilkan data user joomla. Untuk itu file XML-nya dapat dibuat seperti ini:
<?xml version="1.0" encoding="utf-8"?>
<extension type="component" version="2.5.0" method="upgrade">
<name>Hello World!</name>
<!-- The following elements are optional and free of formatting constraints -->
<creationDate>November 2009</creationDate>
<author>John Doe</author>
<authorEmail>john.doe@example.org</authorEmail>
<authorUrl>http://www.example.org</authorUrl>
<copyright>Copyright Info</copyright>
<license>License Info</license>
<!-- The version string is recorded in the components table -->
<version>0.0.1</version>
<!-- The description is optional and defaults to the name -->
<description>Description of the Hello World component ...</description>
<update> <!-- Runs on update; New in 2.5 -->
<schemas>
<schemapath type="mysql">sql/updates/mysql</schemapath>
</schemas>
</update>
<!-- Site Main File Copy Section -->
<!-- Note the folder attribute: This attribute describes the folder
to copy FROM in the package to install therefore files copied
in this section are copied from /site/ in the package -->
<files folder="site">
<filename>index.html</filename>
<filename>helloworld.php</filename>
</files>
<administration>
<!-- Administration Menu Section -->
<menu>Hello World!</menu>
<!-- Administration Main File Copy Section -->
<!-- Note the folder attribute: This attribute describes the folder
to copy FROM in the package to install therefore files copied
in this section are copied from /admin/ in the package -->
<files folder="admin">
<!-- Admin Main File Copy Section -->
<filename>index.html</filename>
<filename>helloworld.php</filename>
<!-- SQL files section -->
<folder>sql</folder>
</files>
</administration>
</extension>
