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xschem can now also be used as a diff tool to compare differences between two versions of a schematic.
`xschem --diff test_solar_panel2.sch test_solar_panel.sch`
in this example the reference test_solar_panel.sch is compared against solar_panel2.sch.
This can be done also with subversion or git (with some revision control system configuration, expecially for git) to compare a current schematic with an older commit.
Details are explained in this <https://xschem.sourceforge.io/stefan/xschem_man/video_tutorials/xschem_diff.mp4|video>

For git the following configuration lines in `~/.gitconfig` do the job:
```[difftool "xschem"]
cmd = /path/to/xschem --diff \"$LOCAL\" \"$REMOTE\"```
and comparison with an older commit is done with:
```git difftool -t xschem  625495e27a529c2a42dbf339457e7b5bae8fc3f0  xschem_library/examples/poweramp.sch```

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