For new users, I just wanted to add one tip to the above:
A simple way to post your xml to the forum is to right-click on the command in your command tree, select "copy" and then paste it into a code block on the forum (using the # "insert code" forum button).
You can copy commands, or entire groups this way.
Similarly, you can simply select the xml displayed in a code block on the forum and paste it into a group in your own tree if you want to try it out.
Obviously, this method is also appropriate in other parts of the forum, not just the XML exchange boards (e.g., if you want some help figuring out what's wrong with your code).