TYPO3 v7 has reached its end-of-life November 30th, 2018 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
There is no further ELTS support. It is recommended that you upgrade your project and use a supported version of TYPO3.
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.