[marginalia_nu]

Have you considered XML?

[MarkSweep]

Or heck, PLists. They have an XML representation that is fairly similar to what JSON can express.

https://en.wikipedia.org/wiki/Property_list

[mdaniel]

As someone who has tried to parse this crazypants as a side-effect of the old 1Password.opvault, please don't. The idea that one has to //key[text()=="firstname"]/following-sibling::string/text() because they're not nested they're siblings. Insanity