What format does iPhone text message stores?

Does anyone know what format does iPhone text message stores?

?
Last time I checked, they were in some sort of database. But obviously that requires a jailbroken device and some way of accessing the file system.

According to this site: https://www.theiphonewiki.com/wiki/Messages
They're stored in: /var/mobile/Library/SMS/ and the files have a.db file extension as well as other extensions.

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