Am 26.01.2014 20:51, schrieb Reindl Harald: > Am 26.01.2014 20:45, schrieb Chris Murphy: >>> So ? >>> It is only visible if you downgrade which a lot of software do not >>> support and explicitly so >> >> The right way to do file format changes is you design the new format. >> And in a minor version update, the application gains the ability to >> read the new file format, but still writes the old file format. >> The major version upgrade of the application is enabled to write the >> new file format, while it can read either old or new formats. > > please look at the hidden folders in your userhome and /var/lib/ > to get a picture about what we are talking here > >> If Adobe Photoshop version n.1.0 started to write out Photoshop documents >> in a manner that n.0.0 could not read, 100% of users would call it a major >> bug, >> and it would escalate into vicious name calling > > nobody but you is talking about documents the user really visualizes > >> Breaking downward compatibility in file formats for regular Joe user is >> courting >> public relations disaster. It can kill a product. Even Microsoft doesn't do >> this lightly > > nobody but you is talking about documents the user really visualizes
you may also read http://en.wikipedia.org/wiki/SQLite * sqlite is used by a lot of software to store data * a new feature in a new version may change the scheme * you do not need care about that * the new software version recognizes the old format and applies changes * the old software version may ignore new tables and columns * it continues to ignore them and don't donwgrade the version info stored somewhere * the new version after the next update expects consistent data in the new format * your downgrade and still work with the sqlite database may lead to regret doing so months later again: *nobody* is talking about documents and the same which is done with sqlite may be *whatever* format of store internal data but is affected by the same problematic - *nobody* really supports downgrades they *may* work fine, there *maybe* are no changes nobody is telling you so - why? - because what you are doing is not supported so *please* stop talking about document formats in *that* thread
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