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Last Modified: 10.10.2012
The simple component template folder can contain the following folders and subfolders:
The subfolder lang containing component language-dependent messages in nested subfolders.
The subfolder names are the abbreviations of languages in which the text messages are stored.
A good practice is to save a text message file under the same name as a corresponding file of the component, and store it in the same folder hierarchy.
For example, the file with English messages for /install/uninstall.php is to be saved in /lang/en/install/uninstall.php.
The lang folder is optional if the component does not use language-dependent messages.
The file result_modifier.php. It is included immediately before the inclusion of a component template.
This file takes the component results as an array $arResult, and the component input array $arParams.
This allows to change the contents of $arResult as required.
Imagine a system component that does everything you need but does not return some important field.
A straightforward solution is to develop a custom component.
But this approach is time and resource consuming, and the component will not be updated via the update system.
Instead, you can create a file result_modifier.php in the component template and add a missing field to $arResult.
This file (result_modifier.php) is optional.
The file style.css with the styles required by the template.
The file is applied if a template requires custom styles.
The style.css file is included automatically if it exists in the template folder.
This file is optional.
The file .description.php containing the template name and description for the editor.
For example, the Menu (bitrix:menu) component has this file defining the template name and description in the component parameters. The .description.php file is optional.
The file .parameters.php containing the description of the template input parameters for the editor.
For example, the News List (bitrix:news.list) component template had this file defining the template settings in the component parameters (element date, element name etc.). This file is optional.
The file template.ext, which is the template itself. The .ext extension depends on the template engine used. The default extension is .php. This file must exist.
Any other folders and files containing the resources required by the component, for example: the folder images containing the template images.