Bingo. Which is why it's a quality not to have dependencies on any specific software when designing a format for longevity. XML has an absolute minimum of such dependencies, Open Document has only zip added to the mix, which is a format with tons of different and independent implementations, plenty of documentation for how to implement it - on top of being a fairly simple format to begin with.

SQLite for all it's significant qualities are none of that, and thus you shouldn't use it if designing for file format longevity.