title: What do the numbers in a version typically represent (i.e. v1.9.0.1)?
body: <p>Maybe this is a silly question, but I've always assumed each number delineated by a period represented a single component of the software. If that's true, do they ever represent something different?  I'd like to start assigning versions to the different builds of my software, but I'm not really sure how it should be structured.  My software has five distinct components.</p>