Generally, any time you have a pairing of an "op" to a variadic list of arguments in a transfer format, you have an s-expression. This method, like many others,

Generally, any time you have a pairing of an "op" to a variadic list of arguments in a transfer format, you have an s-expression. This method, like many others, introduces a bunch of new characters: - "op", "path", "value" - quotes around paths - colons, commas - curly braces In exchange for parentheses. More generally though, we have an isomorphism. If transformation between the forms is trivial, then use what form is more comfortable for you, but I think being able to identify the 'op' -> 'var-args' pairing is a good thing to keep an eye on. It's macros' bread and butter.