VersioningPolicy - softwareunderground/xsdf GitHub Wiki
Versioning policies ==
We have to guarantee, from day 1, that any data stored via our tools is and will be readable for any newer version of the toolkit.
We also want to do our best to make old toolkits read newer data. There are measures we can take to make this more likely, but failure can not always be avoided. What we have to do is at least handle the situation gracefully.