query-spec.txt

	query = resource-type, [fields], [condition];
	resource-type = string;
	fields = "(", string, [",", {string}], ")";
	condition = ":"	, (integer, "..", integer)
			| (integer, "_", positive-integer)
			| integer
			| string 
			| ("~", integer)
			| "*";
	string = alphanumerical, { char };
	char = alphanumerical | "-" | "_";
	alphanumerical = alphabetical | digit;
	alphabetical = ?a-z? | ?A-Z?;
	integer = ["-"], positive-integer;
	positive-integer = digit, {digit};
	digit = ?0-9?;