I'm left utterly befuddled by the section in your documentation called "Setting Styles".
Capture of any item is printed within two tags basically like this:
"capture" is probably "caption" - the text displayed in the menu item.
You are right: "inner" and "outer" tags are nested html tags having item caption inside. We used this technique to allow more flexibility. Not all the browsers allow to set all properties with the single tag. Use outer tag for background, border etc. and inner tag to set text settings like text color, font etc.