Xliff Editor provides the easiest way of editing your XLIFF files. No more messing around with the XML format, or worrying about file corruption. Xliff Editor includes full search support, handy keyboard shortcuts, and even basic read support for SDLXliff files!
XLIFF files are based on the standard XML format, and are used specifically to exchange localisation data. Xcode 6 introduced the ability to export/import all your localisation data, taking away the need for sending various file formats to your localisers for translating. The XLIFF format makes translating a cinch, as it removes all the layout and formatting, and just provides a simple text-to-text translation mechanism for your translators. (Currently only XLIFF v1.2 files are supported.)