Outdated TYPO3 Version
This documentation refers to an outdated TYPO3 version - either select a supported version or make sure to use a TYPO3 Extended Long Term Support (ELTS) version to continue getting security updates.
Migration to XLIFF and compatibility issues¶
Migrating the “locallang” files from one’s own extension from the proprietary XML format to XLIFF is very easy. Extension “extdeveval” provides a tool for changing the file format.
Compatibility with TYPO3 CMS 4.5¶
XLIFF files are not supported by TYPO3 CMS 4.5 or older versions. If you still want to migrate your files to XLIFF and stay compatible with older TYPO3 versions, you can make your extensions depend on extension “xliff”. This extension takes care of creating the locallang-XML files out of the XLIFF versions.
When referring to a localized file, the file extension does not matter.
This means that both
LLL:EXT:foo/locallang.xlf:bar can be used interchangeably.