Create a tag line with @var{exp-button-type} for the small expansion
button. This is the button that expands or contracts a node (if
applicable), and @var{exp-button-char} the character in it (@samp{+},
-@samp{-}, @samp{?}, etc). @var{exp-button-function} is the function
+@samp{-}, @samp{?}, etc.). @var{exp-button-function} is the function
to call if it's clicked on. Button types are @code{bracket},
@code{angle}, @code{curly}, @code{expandtag}, @code{statictag}, and
@code{nil}. @var{exp-button-data} is extra data attached to the text
Next, @var{tag-button} is the text of the tag.
@var{tag-button-function} is the function to call if clicked on, and
@var{tag-button-data} is the data to attach to the text field (such a
-tag positioning, etc). @var{tag-button-face} is a face used for this
+tag positioning, etc.). @var{tag-button-face} is a face used for this
type of tag.
Lastly, @var{depth} shows the depth of expansion.