Again suggested to me by real life friend and previous DC server admin, Gothic:
Protocol Buffers, from google:https://developers.g...om/protocol-buffers/
"Protocol buffers are Google's language-neutral, platform-neutral, extensible mechanism for serializing structured data – think XML, but smaller, faster, and simpler. You define how you want your data to be structured once, then you can use special generated source code to easily write and read your structured data to and from a variety of data streams and using a variety of languages."
Looks quite nice -- and lighter weight in all ways than xml.