Queries

Hi @rupeshk, thanks for creating this library. I have a few questions regarding the code. I would really appreciate it if you could address them

1) In the `BQRFormat` json, "type" of "C" is used of nested tags?
2) The parameter "usage" in the `BRQFormat` json is for validation purposes? "O" being "optional", "M" being "Mandatory" and "C" being "conditional"?
3) Will you be open to PRs?