Welcome to Emboss, the Embedded Systems Binary Structure Tool.
If you are new to Emboss, a good place to start would be the User Guide.
The C++ User Guide has an (incomplete) explanation of the generated C++ code.
Details of the Emboss language can be found in the Emboss Language Reference.
A reference to the C++ code that Emboss generates can be found in the Emboss C++ Generated Code Reference.
Details of the textual representation Emboss uses for structures can be found in the Emboss Text Format Reference.
There is a tentative roadmap of future development.
If you are interested in contributing to Emboss, please read Contributing to Emboss, and you may wish to read How to Design Features for Emboss and How to Implement Changes to Emboss.