XML-RPC is a set of implementations that allow software running on disparate operating systems, running in different environments to make procedure calls over the Internet. It's design goal is to be as simple as possible. |FF0000|I like it already| Like in WDDX there are a number of supported data types 32-bit signed integer (-12) boolean (0 or 1) ASCII string (hello world) doubles/floats (-12.214) date/time ISO8601 (YYYYMMDD HH:MM:SS) base64-encoded binary (eW91IGNhbid0IHJlYWQgdGhpcyE=) stucts (objects) arrays