Elements in mapping and lists are separated with ,.
Mapping is surrounded with {}. Elements in mapping are encoded as name:value. Name is encoded without quotes if it consists of digits or uppercase or lowercase letter (a-z) or _. Name must not start with a number. Quoted name can contain anything, see strings. Value can be anything.
List is surrounded with []. Values can be anything. Top level object in streams is a list. So stream starts with [ and ends with ] (same as <atlas> and </atlas> in XML).
Integer can start with +- (optional) and digits.
Float numbers consist of mantissa and exponent (optional). Mantissa can contain one .. Otherwise they are encoded as integers and are separated with e or E (in case there is an exponent).
String is surrounded with " and " is quoted as \" and \ is quoted as \\. (in future may allow octals and special characters like \n).
# is comment character: all character from this to end of line is comment. (Might be some day decoded as "comment" -attribute or something equivalent)
Whitespace is allowed outside values and names (Regular expression \s or any of \t \n\r\f\v).
Example:
{
parents: ["info"],
arg: {
name: "Joe",
pos: [4.5, 6.7, 2.3],
meaning_of_life: 42
}
}