DiffX - Next-Generation Extensible Diff Format¶ If you’re a software developer, you’ve probably worked with diff files. Diff files show the differences between two text files, in the form of inserted ( + ) and deleted ( - ) lines. Still, we can build upon this, taking some of the best parts from Git diffs and from other standards, and using the forgiving nature of Unified Diffs to define a new, structured Unified Diff format. DiffX files¶ We propose a new format called Extensible Diffs, or DiffX files for short. If you want to get your hands dirty, check out the DiffX File Format Specification.