iOS XLIFF files are Xcode generated files, composed of one or more elements. Each element corresponds to an original file or source (e.g. database table). A contains the source of the localizable data and, once translated, the corresponding localized data for one, and only one, locale. Localizable data are stored in elements. The element holds a element to store the source text, and a element to store the latest translated text. The elements are not mandatory.