The introductory paragraph for "Handling Data and Metadata" introduces the need for formats that can be "used from a number of programming languages ranging from compiled languages such as C, C++, and Fortran on supercomputers/high performance computing resources to perform quantum chemistry calculations through to interpreted languages such as Python for data analysis and JavaScript/TypeScript in web frontends or C/C++ in desktop applications." The second paragraph introduces several standards considered, and mentioned "Large data is preferably stored in binary formats, which is where HDF5 was seen as one strong contender and more recently MessagePack has gained traction due to its JSON-like structure and wide language support thanks to its simple binary specification." We have added paragraph 4 to that section to more fully explain our reasoning, and future paths forward.
General comments: