Paragraph styles can be successively applied and undone in a stack, for example:

leaf.Style 'body'    © base style
leaf.Style 'indent'  © add indenting
leaf.Style 'ind2'    © next level
leaf.PopStyle        © back up
leaf.PopStyle        © revert to base

This allows you to overlay a set of new properties easily, and undo the changes without checking exactly which properties need to be backed out.

There is no limit on the depth of the style stack.