The binary format is open source and documented, that doesn't fit the term "proprietary" to me.
It exports to text, html, xml, csv and more.
The reason it doesn't use any of that as its main storage format is that it tracks a lot of attributes that do not fit those formats naturally (I suppose you can store it all in xml, but I went for speed of loading/saving and smaller storage sizes).
I strongly suspected it was a performance and necessity thing. Not many text-based formats would have easily supported e.g. embedding images, as this tool does.
I do think it looks pretty great, though, and congratulations on the open source launch!
The binary format is open source and documented, that doesn't fit the term "proprietary" to me.
It exports to text, html, xml, csv and more.
The reason it doesn't use any of that as its main storage format is that it tracks a lot of attributes that do not fit those formats naturally (I suppose you can store it all in xml, but I went for speed of loading/saving and smaller storage sizes).