USDL is universal simple data language, which is designed to be easy to parse and easy to use.
USDL's syntax is very simple, it's just a list of key-value pairs, like this:
{
<key1> = 123.456 ;
<key2> = "string" ;
<key3> = [1, 2, 3, [4, 5, 6]] ;
<key4> = {
<key5> = 123 ;
<key6> = "string" ;
} ;
}