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.

Extdeveval screenshot

The locallang conversion utility in extdeveval

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.xml:bar and LLL:EXT:foo/locallang.xlf:bar can be used interchangeably.