title: What is the concept of Head in Subversion and what is the difference to a Trunk
body: <p>I undrstand that a trunk is the "main" branch, and understand the concept of branches and tags. but where does the "head" comes into the picture? It seems it is the "latest" revision? if so than what is it's difference to a "trunk" </p>
  
  <p>I'm sure I'm probably mixing unrelated fields, e.g. trunk is to branch as head is to tags? </p>
  
  <p>I dug into some documentations, but I must admit that it wasn't that clear to me time limiting.</p>