Extensions used for XLIFF and Skeleton are .xlf and .skl. You can convert XLIFF files created with OpenXLIFF Filters to original format using class com.maxprograms.converters.Merge in your Java code.

Guava is a set of core Java libraries from Google that includes new collection types (such as multimap and multiset), immutable collections, a graph library, and utilities for concurrency, I/O, ...