Insert one DefaultStyledDocument into another DefaultStyledDocument

Question

I want to insert one DefaultStyledDocument into another DefaultStyledDocument. How do I do this? I know of this method:

AbstractDocument.insertString(int offs,
                         String str,
                         AttributeSet a)

What I really want is something like this:

DefaultStyledDocument.insertDocument(int offs,
                         AbstractDocument doc)

Is there a way of doing this?