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post	XOS Guide

This guide gives an overview of XOS, including detailed information about using, developing, and operating XOS. It also includes release notes and a roadmap. This guide is an evolving document. We are using it in lieu of a Wiki.

To help frame the discussion, this guide distinguishes among three distinct but related terms:

Everything-as-a-Service (XaaS) is the organizing principle that underlies XOS's design.
XaaS Operating System (XOS) is a Cloud OS that that implements the XaaS architecture.
OpenCloud is an operational cloud that runs XOS and spans a set of servers distributed across multiple sites world-wide.

This guide is primarily about XOS, but it is often necessary to talk about an operational deployment of XOS, in which case we use OpenCloud as a representative example. It is most accurate to think of OpenCloud as one use case built using XOS. Another important XOS use case is CORD (Central Office Re-architected as a Datacenter).