This is an XML editor for Civ4 that is extremely easy to use. It should cut the amount of time you spend editing XML files dramatically. It sorts the data from the xml file and makes it easier to read. You just have to click on a given element to bring up a dialog box that allows you to edit it.
To use the editor - just download it, open the folder, and click on the "Civ4 XML Editor" shortcut. Once you open the editor, try clicking on the Help button for some ideas on how to use it.
Current version is 1.13.
Here is a forum thread about the editor.
Civ4 XML Editor 2016-10-05
Civ4 XML Editor