Zcode - File format documentation?


Is there any information on the zcode file format available, or is the zcode format "locked"/not official? I may like to write my own pre preparation software to generate zcode files from 3D models? 

Can I read its documentation somewhere? I would like to experiment with things like custom raft and support as well as eventually create an zcode export plugin for my main 3D-software?

Thanks in advance.

Its closed format, you won't get any documentation and HOWTO ever. You may treat it as official statement. 

Ok fair enough.